├── .github └── FUNDING.yml ├── LICENSE ├── README.md ├── pmeter.c ├── pmeter.h └── pmeterConfig.h /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | # These are supported funding model platforms 2 | 3 | github: [nimaltd] 4 | patreon: # Replace with a single Patreon username 5 | open_collective: # Replace with a single Open Collective username 6 | ko_fi: nimaltd 7 | tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel 8 | community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry 9 | liberapay: #nimaltd 10 | issuehunt: #nimaltd 11 | otechie: # Replace with a single Otechie username 12 | custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2'] 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # power meter 2 | 3 | * Author: Nima Askari 4 | * WebSite: https://www.github.com/NimaLTD 5 | * Instagram: https://www.instagram.com/github.NimaLTD 6 | * LinkedIn: https://www.linkedin.com/in/NimaLTD 7 | * Youtube: https://www.youtube.com/channel/UCUhY7qY1klJm1d2kulr9ckw 8 | 9 | AC power meter based on STM32 ADC 10 | 11 | * Setlect a ADC and enable 2 channel, v and i. 12 | * Set number of conversion to 2. 13 | * Set enable scan conversion. 14 | * Set disable continous conversion. 15 | * Set disable discontinous conversion. 16 | * Set disable DMA continous conversion. 17 | * Set end of single conversion. 18 | * Select trigger out event a timer for external trigger. 19 | * Select trigger rising edge. 20 | * Select both ranks with correct channel. 21 | * Set enable DMA normal mode. 22 | * Set internal clock for selected timer. 23 | * Set update event on trigger evnet selection on timer configuration menu. 24 | * Add library on project. 25 | * Configure "pmeterConfig.h". 26 | * Put "pmeter_callback()" in adc dma callback. 27 | * Call "pmeter_init(timer freq: ex:32, calibration data from eeprom)". 28 | * Put "pmeter_loop()" in infinite loop. 29 | * before using, you should be calibrate. 30 | * Call "pmeter_calib_step1_..." to "pmeter_calib_step4_..." and store the calibration data "pmeter.calib". 31 | ``` 32 | void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) 33 | { 34 | pmeter_callback(); 35 | } 36 | 37 | void main() 38 | { 39 | pmeter_calib_t calib; 40 | ... 41 | // load calibration data from eeprom to calib struct 42 | ... 43 | pmeter_init(32, calib); 44 | while(1) 45 | { 46 | pmeter_loop(); 47 | } 48 | } 49 | ``` 50 | 51 | 52 | 53 | 54 | -------------------------------------------------------------------------------- /pmeter.c: -------------------------------------------------------------------------------- 1 | 2 | #include "pmeter.h" 3 | #include 4 | #include 5 | #include 6 | 7 | #if (_PMETER_RTOS == 0) 8 | #define pmeter_delay(x) HAL_Delay(x) 9 | #else 10 | #include "cmsis_os.h" 11 | #include "freertos.h" 12 | #define pmeter_delay(x) osDelay(x) 13 | #endif 14 | #if (_PMETER_DEBUG == 1) 15 | #include 16 | #define pmeter_printf(...) printf(__VA_ARGS__) 17 | #else 18 | #define pmeter_printf(...) {}; 19 | #endif 20 | 21 | extern TIM_HandleTypeDef _PMETER_TIM; 22 | extern ADC_HandleTypeDef _PMETER_ADC; 23 | 24 | pmeter_t pmeter; 25 | 26 | //################################################################################################### 27 | void pmeter_callback(void) 28 | { 29 | if (pmeter.buff_inedex == 0) 30 | { 31 | pmeter.buff_done = 1; 32 | pmeter.buff_inedex = 1; 33 | } 34 | else 35 | { 36 | pmeter.buff_done = 1; 37 | pmeter.buff_inedex = 0; 38 | } 39 | HAL_ADC_Start_DMA(&_PMETER_ADC, (uint32_t*)pmeter.buff[pmeter.buff_inedex], _PMETER_SAMPLE * 2); 40 | } 41 | //################################################################################################### 42 | void pmeter_init(uint16_t timer_freq_mhz, pmeter_calib_t pmeter_calib) 43 | { 44 | _PMETER_TIM.Instance->PSC = timer_freq_mhz - 1; 45 | _PMETER_TIM.Instance->ARR = (uint32_t)((float)_PMETER_SAMPLE / (((float)_PMETER_SAMPLE / 1000.0f) * ((float)_PMETER_SAMPLE / 1000.0f))) - 1; 46 | memcpy(&pmeter.calib, &pmeter_calib, sizeof(pmeter_calib_t)); 47 | HAL_TIM_Base_Start(&_PMETER_TIM); 48 | HAL_ADC_Start_DMA(&_PMETER_ADC, (uint32_t*)pmeter.buff[pmeter.buff_inedex], _PMETER_SAMPLE * 2); 49 | pmeter_printf("[pmeter] init done. timer frequency: %d MHz\r\n", timer_freq_mhz); 50 | } 51 | //################################################################################################### 52 | void pmeter_resume(void) 53 | { 54 | HAL_TIM_Base_Start(&_PMETER_TIM); 55 | HAL_ADC_Start_DMA(&_PMETER_ADC, (uint32_t*)pmeter.buff[pmeter.buff_inedex], _PMETER_SAMPLE * 2); 56 | pmeter_printf("[pmeter] resume done.\r\n"); 57 | } 58 | //################################################################################################### 59 | void pmeter_pause(void) 60 | { 61 | HAL_TIM_Base_Stop(&_PMETER_TIM); 62 | HAL_ADC_Stop_DMA(&_PMETER_ADC); 63 | _PMETER_TIM.Instance->CNT = 0; 64 | pmeter.buff_done = 0; 65 | pmeter_printf("[pmeter] pause done.\r\n"); 66 | } 67 | //################################################################################################### 68 | uint8_t pmeter_loop(void) 69 | { 70 | if (pmeter.buff_done == 1) 71 | { 72 | pmeter.buff_done = 0; 73 | uint32_t v_sum_sq = 0, i_sum_sq = 0; 74 | int32_t p_sum = 0; 75 | for (uint16_t i = 0; i <= (_PMETER_SAMPLE * 2) - 2; i += 2) 76 | { 77 | int32_t v_signed, i_signed; 78 | v_signed = pmeter.buff[1 - pmeter.buff_inedex][i + _PMETER_RANK_V - 1] - pmeter.calib.center; 79 | v_sum_sq += (v_signed * v_signed); 80 | i_signed = pmeter.buff[1 - pmeter.buff_inedex][i + _PMETER_RANK_I - 1] - pmeter.calib.center; 81 | if (i_signed > _PMETER_ADC_NOISE_VALUE || i_signed < -_PMETER_ADC_NOISE_VALUE) 82 | { 83 | i_sum_sq += (i_signed * i_signed); 84 | p_sum += i_signed * v_signed; 85 | } 86 | } 87 | pmeter.v_raw = (float)sqrt((float)v_sum_sq / (float)_PMETER_SAMPLE); 88 | pmeter.v = (pmeter.v_raw - pmeter.calib.v_raw_low) * (pmeter.calib.v_ref_high - pmeter.calib.v_ref_low); 89 | pmeter.v /= (pmeter.calib.v_raw_high - pmeter.calib.v_raw_low); 90 | pmeter.v += pmeter.calib.v_ref_low; 91 | if (isinf(pmeter.v)) 92 | pmeter.v = 0; 93 | if (pmeter.v < 0) 94 | pmeter.v = 0; 95 | pmeter.i_raw = (float) sqrt((float) i_sum_sq / (float) _PMETER_SAMPLE); 96 | pmeter.i = (pmeter.i_raw - pmeter.calib.i_raw_low) * (pmeter.calib.i_ref_high - pmeter.calib.i_ref_low); 97 | pmeter.i /= (pmeter.calib.i_raw_high - pmeter.calib.i_raw_low); 98 | pmeter.i += pmeter.calib.i_ref_low; 99 | if (isinf(pmeter.i)) 100 | pmeter.i = 0; 101 | if (pmeter.i < 0) 102 | pmeter.i = 0; 103 | pmeter.va = pmeter.v * pmeter.i; 104 | pmeter.w_raw = (float)((float)p_sum / (float)_PMETER_SAMPLE); 105 | pmeter.w = (pmeter.w_raw - pmeter.calib.w_raw_low) * (pmeter.calib.w_ref_high - pmeter.calib.w_ref_low); 106 | pmeter.w /= (pmeter.calib.w_raw_high - pmeter.calib.w_raw_low); 107 | pmeter.w += pmeter.calib.w_ref_low; 108 | if (pmeter.w < 0) 109 | pmeter.w = 0; 110 | if (pmeter.w > pmeter.va) 111 | pmeter.w = pmeter.va; 112 | pmeter.pf = pmeter.w / pmeter.va; 113 | if (isnan(pmeter.pf)) 114 | pmeter.pf = 1.0f; 115 | pmeter.fi = 360.0f * (acosf(pmeter.pf) / (2.0f * 3.14159265f)); 116 | pmeter.var = pmeter.v * pmeter.i * sinf(pmeter.fi); 117 | if (isnan(pmeter.var)) 118 | pmeter.var = 0; 119 | pmeter.wh += pmeter.w / 3600.0f; 120 | pmeter.vah += pmeter.va / 3600.0f; 121 | pmeter.varh += pmeter.var / 3600.0f; 122 | return 1; 123 | } 124 | else 125 | return 0; 126 | } 127 | //################################################################################################### 128 | void pmeter_reset_counter(void) 129 | { 130 | pmeter.vah = 0; 131 | pmeter.wh = 0; 132 | pmeter.varh = 0; 133 | } 134 | //################################################################################################### 135 | void pmeter_set_counter(float vah, float wh, float varh) 136 | { 137 | pmeter.vah = vah; 138 | pmeter.wh = wh; 139 | pmeter.varh = varh; 140 | } 141 | //################################################################################################### 142 | void pmeter_calib_step1_without_load_v_high(float rms_voltage) 143 | { 144 | while (pmeter_loop() == 0) 145 | pmeter_delay(1); 146 | while (pmeter_loop() == 0) 147 | pmeter_delay(1); 148 | uint32_t sum = 0; 149 | for (uint16_t i = _PMETER_RANK_I - 1; i < _PMETER_SAMPLE * 2; i += 2) 150 | sum += pmeter.buff[1 - pmeter.buff_inedex][i]; 151 | sum = sum / _PMETER_SAMPLE; 152 | pmeter.calib.center = sum; 153 | while (pmeter_loop() == 0) 154 | pmeter_delay(1); 155 | pmeter.calib.v_ref_high = rms_voltage; 156 | pmeter.calib.v_raw_high = pmeter.v_raw; 157 | } 158 | //################################################################################################### 159 | void pmeter_calib_step2_without_load_v_low(float rms_voltage) 160 | { 161 | while (pmeter_loop() == 0) 162 | pmeter_delay(1); 163 | while (pmeter_loop() == 0) 164 | pmeter_delay(1); 165 | pmeter.calib.v_ref_low = rms_voltage; 166 | pmeter.calib.v_raw_low = pmeter.v_raw; 167 | } 168 | //################################################################################################### 169 | void pmeter_calib_step3_resistor_load_i_high(float rms_current) 170 | { 171 | while (pmeter_loop() == 0) 172 | pmeter_delay(1); 173 | while (pmeter_loop() == 0) 174 | pmeter_delay(1); 175 | pmeter.calib.i_ref_high = rms_current; 176 | pmeter.calib.i_raw_high = pmeter.i_raw; 177 | pmeter.calib.w_raw_high = pmeter.w_raw; 178 | pmeter.calib.w_ref_high = rms_current * pmeter.v; 179 | } 180 | //################################################################################################### 181 | void pmeter_calib_step4_resistor_load_i_low(float rms_current) 182 | { 183 | while (pmeter_loop() == 0) 184 | pmeter_delay(1); 185 | while (pmeter_loop() == 0) 186 | pmeter_delay(1); 187 | pmeter.calib.i_ref_low = rms_current; 188 | pmeter.calib.i_raw_low = pmeter.i_raw; 189 | pmeter.calib.w_raw_low = pmeter.w_raw; 190 | pmeter.calib.w_ref_low = rms_current * pmeter.v; 191 | } 192 | //################################################################################################### 193 | void pmeter_calib_set(pmeter_calib_t pmeter_calib) 194 | { 195 | memcpy(&pmeter.calib, &pmeter_calib, sizeof(pmeter_calib_t)); 196 | } 197 | //################################################################################################### 198 | -------------------------------------------------------------------------------- /pmeter.h: -------------------------------------------------------------------------------- 1 | 2 | #ifndef _PMETER_H_ 3 | #define _PMETER_H_ 4 | #include "main.h" 5 | #include "pmeterConfig.h" 6 | 7 | /* 8 | * AC power meter library based on STM32 internal ADC 9 | * 10 | * Author: Nima Askari 11 | * WebSite: https://www.github.com/NimaLTD 12 | * Instagram: https://www.instagram.com/github.NimaLTD 13 | * LinkedIn: https://www.linkedin.com/in/NimaLTD 14 | * Youtube: https://www.youtube.com/channel/UCUhY7qY1klJm1d2kulr9ckw 15 | */ 16 | 17 | /* 18 | * Version: 1.2.1 19 | * 20 | * History: 21 | * (1.2.1): Add pmeter_pause(), pmeter_resume(), pmeter_set_counter() functions. 22 | * (1.2.0): Change to 2 point calibration. Fix some bugs. 23 | * (1.1.0): Bug fixed. Do not need ratio of resistors and CT. 24 | * (1.0.4): Improve VAR Accuracy. 25 | * (1.0.3): Fix NaN values. 26 | * (1.0.2): Fix calibration. 27 | * (1.0.1): Fix configuration timer value. 28 | * (1.0.0): First release. 29 | */ 30 | 31 | #ifdef __cplusplus 32 | extern "C" { 33 | #endif 34 | 35 | typedef struct 36 | { 37 | uint32_t center; 38 | float v_raw_low; 39 | float v_raw_high; 40 | float i_raw_low; 41 | float i_raw_high; 42 | float w_raw_low; 43 | float w_raw_high; 44 | float v_ref_low; 45 | float v_ref_high; 46 | float i_ref_low; 47 | float i_ref_high; 48 | float w_ref_low; 49 | float w_ref_high; 50 | 51 | }pmeter_calib_t; 52 | 53 | typedef struct 54 | { 55 | uint16_t buff[2][_PMETER_SAMPLE * 2]; 56 | uint8_t buff_inedex; 57 | uint8_t buff_done; 58 | pmeter_calib_t calib; 59 | float v_raw; 60 | float i_raw; 61 | float w_raw; 62 | float v; 63 | float i; 64 | float va; 65 | float w; 66 | float var; 67 | float vah; 68 | float wh; 69 | float varh; 70 | float pf; 71 | float fi; 72 | 73 | }pmeter_t; 74 | 75 | extern pmeter_t pmeter; 76 | 77 | //############################################################################################ 78 | void pmeter_callback(void); // adc dma callback 79 | void pmeter_init(uint16_t timer_freq_mhz, pmeter_calib_t pmeter_calib); // init power meter 80 | void pmeter_resume(void); // resume 81 | void pmeter_pause(void); // pause 82 | uint8_t pmeter_loop(void); // after update value, return 1 83 | void pmeter_reset_counter(void); // reset all wh,vah,varh 84 | void pmeter_set_counter(float vah, float wh, float varh); // set init value 85 | 86 | void pmeter_calib_step1_without_load_v_high(float rms_voltage); 87 | void pmeter_calib_step2_without_load_v_low(float rms_voltage); 88 | void pmeter_calib_step3_resistor_load_i_high(float rms_current); 89 | void pmeter_calib_step4_resistor_load_i_low(float rms_current); 90 | 91 | void pmeter_calib_load(pmeter_calib_t pmeter_calib); // load calibration values 92 | //############################################################################################ 93 | #ifdef __cplusplus 94 | } 95 | #endif 96 | #endif /* _PMETER_H_ */ 97 | -------------------------------------------------------------------------------- /pmeterConfig.h: -------------------------------------------------------------------------------- 1 | 2 | 3 | #ifndef _PMETERCONFIG_H_ 4 | #define _PMETERCONFIG_H_ 5 | 6 | #define _PMETER_DEBUG 0 7 | #define _PMETER_RTOS 1 8 | #define _PMETER_TIM htim15 9 | #define _PMETER_ADC hadc1 10 | #define _PMETER_RANK_V 1 11 | #define _PMETER_RANK_I 2 12 | #define _PMETER_SAMPLE 1000 13 | #define _PMETER_ADC_NOISE_VALUE 5 14 | 15 | #endif /* _PMETERCONFIG_H_ */ 16 | --------------------------------------------------------------------------------