├── stl ├── top.stl ├── bottom.stl └── LICENSE ├── img ├── making │ ├── 0.JPEG │ ├── 1.JPEG │ ├── 2.JPEG │ ├── 3.JPEG │ ├── 4.JPEG │ ├── 5.JPEG │ └── 6.JPEG └── pin wiring diagram.png ├── README.md └── code ├── OpenPhoneCameraTrigger.ino └── LICENSE /stl/top.stl: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/stl/top.stl -------------------------------------------------------------------------------- /stl/bottom.stl: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/stl/bottom.stl -------------------------------------------------------------------------------- /img/making/0.JPEG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/making/0.JPEG -------------------------------------------------------------------------------- /img/making/1.JPEG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/making/1.JPEG -------------------------------------------------------------------------------- /img/making/2.JPEG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/making/2.JPEG -------------------------------------------------------------------------------- /img/making/3.JPEG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/making/3.JPEG -------------------------------------------------------------------------------- /img/making/4.JPEG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/making/4.JPEG -------------------------------------------------------------------------------- /img/making/5.JPEG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/making/5.JPEG -------------------------------------------------------------------------------- /img/making/6.JPEG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/making/6.JPEG -------------------------------------------------------------------------------- /img/pin wiring diagram.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/junsulee119/OpenPhoneCameraTrigger/HEAD/img/pin wiring diagram.png -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # OpenPhoneCameraTrigger 2 | 3 | ## Table of Contents 4 | 1. [Introduction](#introduction) 5 | 2. [Features](#features) 6 | 3. [How to Build Your Own OpenPhoneCameraTrigger](#how-to-build-your-own-openphonecameratrigger) 7 | 1. [Required Components](#1-required-components) 8 | 2. [Setting Up the Development Environment](#2-setting-up-the-development-environment-for-esp32) 9 | 3. [Coding and Running](#3-coding-and-running) 10 | 4. [Wiring and Connection Diagram](#4-wiring-and-connection-diagram) 11 | 5. [3D Printing and Assembling the Enclosure](#5-3d-printing-and-assembling-the-enclosure) 12 | 4. [Version History](#code-version-history) 13 | 5. [Future improvement](#future-improvement) 14 | 6. [License](#license) 15 | 16 | ## Introduction 17 | OpenPhoneCameraTrigger is a project designed to enable wireless control of camera trigger using an ESP32 based board. With this project, you can send volume control signals to trigger your phone camera's shutter remotely. 18 | 19 | [![demoVideo](https://img.youtube.com/vi/Z1O2nStRBFU/0.jpg)](https://www.youtube.com/watch?v=Z1O2nStRBFU) 20 | **Click the image to see Demo video!!** 21 | 22 | --- 23 | 24 | ## Features 25 | - Wireless phone camera trigger via Bluetooth. 26 | - Compact and portable design. 27 | - Easy to customize and extend functionality. 28 | - Open-source code and 3D-printable enclosure. 29 | 30 | --- 31 | 32 | ## How to Build Your Own OpenPhoneCameraTrigger 33 | 34 | ### 1. Required Components 35 | Here is a list of components you'll need to build this project: 36 | - **ESP32-C3 Super Mini** – [Link](https://a.aliexpress.com/_oErgR53) 37 | - **Push button** – [Link](https://a.aliexpress.com/_olNm9Id) 38 | - **3.7V** 300mAh 602030 LiPo **Battery** – [Link](https://a.aliexpress.com/_omasVAl) 39 | - TP4057 **Battery Charger Board** – [Link](https://a.aliexpress.com/_onq9YhJ) 40 | - Dupont cable or jumper wire 41 | 42 | Other 43 | - USB type-C cable to connect esp32 with pc 44 | - PC or Laptop etc.. for coding and debugging 45 | 46 | To build enclosure 47 | - 3D-printed enclosure (stl files in [stl](https://github.com/junsulee119/OpenPhoneCameraTrigger/tree/main/stl)) 48 | - M2.5 OD4mm 5mm long Threaded insert * 2 [Link](https://a.aliexpress.com/_oCb7Maz) 49 | - M2.5 6mm long bolt [Link](https://a.aliexpress.com/_olOMYyt) 50 | 51 | --- 52 | 53 | ### 2. Setting Up the Development Environment for ESP32 54 | Follow these steps to set up your development environment: 55 | 1. Install Arduino IDE (Tested on version 2.3.3) 56 | 2. Add the ESP32 board package to the IDE (Tested on version 3.1.0-RC3) 57 | 1. Go to **Tools > Board > Boards Manager** or **Ctrl+Shift+B** 58 | 2. Serch **'esp32'** 59 | 3. Install **'esp32 by Espressif Systems'** 60 | 3. Connect ESP32 to PC and select proper COM port 61 | 1. Connect ESP32 Super Mini board to PC using USB Type-C cable (make sure that the USB cable supports data transmission) 62 | 2. Go to **Tools > Port** and **select proper COM port** that ESP32 is connected at 63 | 4. Select ESP32 SuperMini board 64 | 1. Go to **Tools > Board > esp32** 65 | 2. Select **'Nologo ESP32C3 Super Mini'** (Selecting 'ESP32C3 Dev Module wont work!) 66 | 67 | 68 | --- 69 | 70 | ### 3. Coding and Running 71 | 1. Clone this repository or download the project files. 72 | 2. Open the `OpenPhoneCameraTrigger.ino` file in your IDE. 73 | 3. Compile and upload the code. 74 | 4. Monitor the Serial Output to verify functionality. 75 | 76 | --- 77 | 78 | ### 4. Wiring and Connection Diagram 79 | 80 | >[!TIP] 81 | > Print the enclosure first and then measure the required length for each wire. Otherwise, the enclosure might not fit 82 | 83 | ![making0](img/making/0.JPEG) 84 | 85 | Below is the connection diagram for the project: 86 | 87 | ![Pin wiring diagram](img/pin%20wiring%20diagram.png) 88 | 89 | > [!CAUTION] 90 | > While handling batteries, always solder in a well-ventilated area, wear protective gear, and handle components with care to avoid burns or shorts. Use the correct temperature and soldering techniques, and never leave the iron unattended. When handling batteries, avoid short circuits, punctures, or heat exposure. Store and dispose of batteries properly, and always use the correct charger for safe operation 91 | 92 | --- 93 | 94 | ### 5. 3D Printing and Assembling the Enclosure 95 | 1. Print the provided `.stl` files using a 3D printer. 96 | 2. Gather additional assembly parts. 97 | ![making1](img/making/1.JPEG) 98 | 99 | 3. Insert each PCB part into the corresponding position. 100 | ![making2](img/making/2.JPEG) 101 | 102 | 4. Insert threaded inserts using soldering iron. 103 | ![making3](img/making/3.JPEG) 104 | ![making4](img/making/4.JPEG) 105 | 106 | 5. Assemble top and bottom parts. Be careful not to get any wire stuck between two parts. 107 | ![making5](img/making/5.JPEG) 108 | 109 | 6. Done! 110 | ![making6](img/making/6.JPEG) 111 | 112 | 113 | --- 114 | 115 | ## Code Version History 116 | | Version | Release Date | Change Log | 117 | |---------|--------------|-----------------------------------| 118 | | 1.0.0 | 2024-12-02 | Initial release. | 119 | 120 | --- 121 | 122 | ## 3D enclosure file Version History 123 | | Version | Release Date | Change Log | 124 | |---------|--------------|-----------------------------------| 125 | | 1.0.0 | 2024-12-02 | Initial release. | 126 | | 1.0.1 | 2024-12-20 | Design improvement considering part step difference | 127 | 128 | --- 129 | 130 | 131 | ## Future improvement 132 | - 일정 시간 이상 input 이 없을 경우 idle 상태(deep sleep mode) 전환으로 배터리 사용시간 개선 -> ESP32C3는 Deep-sleep mode 미지원 -> ESP32S3로 시도, Android폰에서 deep sleep이후 인식장애 발생(deep-sleep 으로 인한 BTLE연결정보 손실로 원인 추정) -> RTC메모리 사용하여 연결정보 보존 133 | - 전원 인가시 무조건 BLE advertizing가 아닌 버튼이 꾹 눌리면 페어링모드 (advertizing mode)로 진입하는 것으로 개선 (BLE advertizing은 배터리 소모 높음 → 배터리시간 개선, 전원 인가시 무조건 advertizing mode로 진입하는 것이 아닌 사용자 조작을 통해 사용자의 통제 범위 증가) 134 | - 더 비싼 배터리 충전 / 방전 보드로 idle 상태에서 발생하는 battery drain 양 최소화 혹은 배터리와 배터리 충전 / 방전 보드 사이에 스위치 추가하여 수동으로 키고 끌 수 있게 개선 135 | - 버튼이 눌린 시간 측정하여 버튼 꾹 누르면 영상촬영(각 휴대폰의 음량버튼 꾹 누름 설정) 기능 추가 136 | - 적절한 저항과 납땜장비가 없어 충전보드의 충전전류가 배터리 용량에 비해 과도하게 높은 점 개선 137 | - 충전 LED 정보 외부로 나타나게 개선 138 | 139 | ## License 140 | The code for this project is licensed under the **GNU AGPL v3.0**. 141 | 142 | The 3D enclosure files are licensed under **CC BY-NC-SA 4.0**. 143 | 144 | For more details, see the `LICENSE` file under each directory or visit [GNU AGPL v3.0 License](https://www.gnu.org/licenses/agpl-3.0.html), [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/). 145 | -------------------------------------------------------------------------------- /code/OpenPhoneCameraTrigger.ino: -------------------------------------------------------------------------------- 1 | 2 | //SPDX-FileCopyrightText: © 2024 Junsu Lee 3 | //SPDX-License-Identifier: GNU Affero General Public License v3.0 4 | //Version 1.0.0 5 | 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | 12 | #define HID_CONSUMER_CONTROL 0x030C 13 | 14 | #define BUTTON_PIN 7 // GPIO pin connected to the button 15 | 16 | // Global variables for BLE HID 17 | BLEHIDDevice* hid; 18 | BLECharacteristic* input; 19 | BLEServer* server; 20 | BLEAdvertising* advertising; 21 | 22 | // HID Report Descriptor for Consumer Control (Volume Up) 23 | uint8_t reportMap[] = { 24 | 0x05, 0x0C, // Usage Page (Consumer Page) 25 | 0x09, 0x01, // Usage (Consumer Controls) 26 | 0xA1, 0x01, // Collection (Application) 27 | 0x85, 0x01, // Report ID (1) 28 | 0x15, 0x00, // Logical Minimum (0) 29 | 0x25, 0x01, // Logical Maximum (1) 30 | 0x75, 0x01, // Report Size (1) 31 | 0x95, 0x02, // Report Count (2) - Need 2 bits for Up and Down 32 | 0x09, 0xE9, // Usage (Volume Up) 33 | 0x09, 0xEA, // Usage (Volume Down) 34 | 0x81, 0x02, // Input (Data, Variable, Absolute) 35 | 0x95, 0x06, // Report Count (6) - Padding bits 36 | 0x75, 0x01, // Report Size (1) 37 | 0x81, 0x03, // Input (Constant) 38 | 0xC0 // End Collection 39 | }; 40 | 41 | // Button flag for button shifting (VolUp <-> VolDown) 42 | int btnFlag = 1; // 1 -> VolUp, -1 -> VolDown 43 | 44 | // Callback class for connection events 45 | class MyServerCallbacks : public BLEServerCallbacks { 46 | void onConnect(BLEServer* pServer) { 47 | Serial.println("Device connected"); 48 | } 49 | 50 | void onDisconnect(BLEServer* pServer) { 51 | Serial.println("Device disconnected"); 52 | advertising->start(); // Restart advertising 53 | } 54 | }; 55 | 56 | // Functions to send a Consumer Control key press 57 | void sendVolumeUp() { 58 | Serial.println("Sending Volume Up..."); 59 | uint8_t report[] = {0b00000001}; // Bit 0 for Volume Up 60 | 61 | // Check if input characteristic exists and a device is connected 62 | if (input && server->getConnectedCount() > 0) { 63 | input->setValue(report, sizeof(report)); 64 | input->notify(); 65 | Serial.println("Key press sent!"); 66 | } else { 67 | Serial.println("Cannot send key press - no connection"); 68 | } 69 | } 70 | 71 | void sendVolumeDown() { 72 | Serial.println("Sending Volume Down..."); 73 | uint8_t report[] = {0b00000010}; // Bit 1 for Volume Down 74 | 75 | // Check if input characteristic exists and a device is connected 76 | if (input && server->getConnectedCount() > 0) { 77 | input->setValue(report, sizeof(report)); 78 | input->notify(); 79 | Serial.println("Key press sent!"); 80 | } else { 81 | Serial.println("Cannot send key press - no connection"); 82 | } 83 | } 84 | 85 | // Function to send key release event 86 | void sendKeyRelease() { 87 | Serial.println("Sending key release..."); 88 | 89 | // Empty key report indicates no keys are pressed 90 | uint8_t emptyReport[] = {0b00000000}; 91 | 92 | // Check if input characteristic exists and a device is connected 93 | if (input && server->getConnectedCount() > 0) { 94 | input->setValue(emptyReport, sizeof(emptyReport)); // Set empty report 95 | input->notify(); // Send notification 96 | Serial.println("Key release sent!"); 97 | } else { 98 | Serial.println("Cannot send key release - no connection"); 99 | } 100 | } 101 | 102 | // Initial setup function - runs once when device starts 103 | void setup() { 104 | // Initialize serial communication for debugging 105 | Serial.begin(115200); // Set high baud rate for fast communication 106 | while (!Serial) { delay(10); } // Wait for Serial to be ready 107 | 108 | Serial.println("==== ESP32 BLE Volume Control ===="); 109 | 110 | // ButtonPress setup 111 | // Configure the button pin as input with an internal pull-down resistor 112 | pinMode(BUTTON_PIN, INPUT_PULLDOWN); 113 | 114 | // BLE setup 115 | // Initialize BLE 116 | BLEDevice::init("OpenCameraTrigger"); // Set device name 117 | server = BLEDevice::createServer(); // Create BLE server and set connection callbacks 118 | server->setCallbacks(new MyServerCallbacks()); 119 | 120 | // Security Settings 121 | BLESecurity* security = new BLESecurity(); 122 | security->setAuthenticationMode(ESP_LE_AUTH_BOND); 123 | security->setCapability(ESP_IO_CAP_NONE); 124 | security->setInitEncryptionKey(ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK); 125 | 126 | // Initialize BLE HID 127 | hid = new BLEHIDDevice(server); 128 | input = hid->inputReport(1); // Report ID 1 129 | input->setAccessPermissions(ESP_GATT_PERM_READ_ENCRYPTED | ESP_GATT_PERM_WRITE_ENCRYPTED); 130 | hid->reportMap((uint8_t*)reportMap, sizeof(reportMap)); 131 | hid->manufacturer()->setValue("ESP32 BLE Volume Control"); 132 | hid->pnp(0x02, 0x1234, 0x5678, 0x0100); 133 | hid->hidInfo(0x00, 0x01); 134 | 135 | // Start HID services 136 | hid->startServices(); 137 | 138 | // Configure advertising 139 | advertising = BLEDevice::getAdvertising(); 140 | advertising->setAppearance(HID_CONSUMER_CONTROL); 141 | advertising->addServiceUUID(hid->hidService()->getUUID()); 142 | advertising->start(); 143 | 144 | Serial.println("==== BLE Volume Control Ready ===="); 145 | } 146 | 147 | void loop() { 148 | // Read the state of the button 149 | int buttonState = digitalRead(BUTTON_PIN); 150 | 151 | if (server->getConnectedCount() > 0) { 152 | //Serial.println("Connected - Redy to send keys..."); 153 | 154 | // Check if the button is pressed (HIGH because of the pull-down resistor) 155 | if (buttonState == HIGH) { 156 | Serial.println("Button press detected, sending signal..."); 157 | if (btnFlag > 0) { // If btnFlag == 1 158 | sendVolumeUp(); // Send VolUp 159 | delay(100); // Short delay to simulate key press 160 | sendKeyRelease(); 161 | Serial.println("Volume Up sent!"); 162 | btnFlag *= -1; // Shift btnFlag to -1 163 | } 164 | else if (btnFlag < 0) { // If btnFlag == -1 165 | sendVolumeDown(); // Send VolDown 166 | delay(100); // Short delay to simulate key press 167 | sendKeyRelease(); 168 | Serial.println("Volume Down sent!"); 169 | btnFlag *= -1; // Shift btnFlag to 1 170 | } 171 | delay(300); // Short delay to prevent fast shifting 172 | } 173 | } else { 174 | // If no device is connected, wait and continue checking 175 | Serial.println("Waiting for connection..."); 176 | delay(1000); // No device connected, wait and retry 177 | } 178 | } -------------------------------------------------------------------------------- /stl/LICENSE: -------------------------------------------------------------------------------- 1 | Attribution-NonCommercial-ShareAlike 4.0 International 2 | 3 | ======================================================================= 4 | 5 | Creative Commons Corporation ("Creative Commons") is not a law firm and 6 | does not provide legal services or legal advice. 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No Surrender of Others' Freedom. 529 | 530 | If conditions are imposed on you (whether by court order, agreement or 531 | otherwise) that contradict the conditions of this License, they do not 532 | excuse you from the conditions of this License. If you cannot convey a 533 | covered work so as to satisfy simultaneously your obligations under this 534 | License and any other pertinent obligations, then as a consequence you may 535 | not convey it at all. For example, if you agree to terms that obligate you 536 | to collect a royalty for further conveying from those to whom you convey 537 | the Program, the only way you could satisfy both those terms and this 538 | License would be to refrain entirely from conveying the Program. 539 | 540 | 13. Remote Network Interaction; Use with the GNU General Public License. 541 | 542 | Notwithstanding any other provision of this License, if you modify the 543 | Program, your modified version must prominently offer all users 544 | interacting with it remotely through a computer network (if your version 545 | supports such interaction) an opportunity to receive the Corresponding 546 | Source of your version by providing access to the Corresponding Source 547 | from a network server at no charge, through some standard or customary 548 | means of facilitating copying of software. This Corresponding Source 549 | shall include the Corresponding Source for any work covered by version 3 550 | of the GNU General Public License that is incorporated pursuant to the 551 | following paragraph. 552 | 553 | Notwithstanding any other provision of this License, you have 554 | permission to link or combine any covered work with a work licensed 555 | under version 3 of the GNU General Public License into a single 556 | combined work, and to convey the resulting work. The terms of this 557 | License will continue to apply to the part which is the covered work, 558 | but the work with which it is combined will remain governed by version 559 | 3 of the GNU General Public License. 560 | 561 | 14. Revised Versions of this License. 562 | 563 | The Free Software Foundation may publish revised and/or new versions of 564 | the GNU Affero General Public License from time to time. Such new versions 565 | will be similar in spirit to the present version, but may differ in detail to 566 | address new problems or concerns. 567 | 568 | Each version is given a distinguishing version number. If the 569 | Program specifies that a certain numbered version of the GNU Affero General 570 | Public License "or any later version" applies to it, you have the 571 | option of following the terms and conditions either of that numbered 572 | version or of any later version published by the Free Software 573 | Foundation. If the Program does not specify a version number of the 574 | GNU Affero General Public License, you may choose any version ever published 575 | by the Free Software Foundation. 576 | 577 | If the Program specifies that a proxy can decide which future 578 | versions of the GNU Affero General Public License can be used, that proxy's 579 | public statement of acceptance of a version permanently authorizes you 580 | to choose that version for the Program. 581 | 582 | Later license versions may give you additional or different 583 | permissions. However, no additional obligations are imposed on any 584 | author or copyright holder as a result of your choosing to follow a 585 | later version. 586 | 587 | 15. Disclaimer of Warranty. 588 | 589 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 590 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 591 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 592 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 593 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 594 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 595 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 596 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 597 | 598 | 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | --------------------------------------------------------------------------------