Energy logger using PZEM004T and Arduino UNO+SD shield ver 1.0

void_loop · November 17, 2019, 11:01am

Any help is a good help! I appreciate you for spending some time on this!

Energy Meter: PZEM004T -100A

Arduino:UNO

SD Logger: Ver 1.0 clone with onboard DS1307 RTC

SD card: SD 16GB uSD class 10 A1 HC I

Comms:
SD-SPI
RTC-I2C
PZEM-Serial

Objective: To Measure the V, I, kW, kWh, hz and pf using the PZEM004T made available using the library:

Issue: Not able to use SD card over SPI and PZEM over Serial in the same code. Eventhough I am able to run them sepearately and they work fine. I get it, that there is a comm issue of the Serial but could not find a solution after days of systematic trial and errors. I had used software serial too for the PZEM but the issue persists. I had tried running on half SPI speed to but no good. I could use a Mega as given in

github.com/mandulaj/PZEM-004T-v30

PZEM-004T v3.0 Power and Energy meter" To save data to SD CARD

opened 05:15AM - 10 Jul 19 UTC

closed 05:21PM - 21 Apr 20 UTC

pye222

bug help wanted

"PZEM-004T v3.0 Power and Energy meter" is used very well. But there is one t…hing that is not good. It wants to store the data value in SD CARD. SD CARD stores data by SPI communication. It works well if only one SD card is connected to Arduino. Or "PZEM-004T v3.0 Power and Energy meter". The problem is that if both are connected, it will not work properly. Is there any way? ===============================code ============================== // SD card attached MOSI - pin 11, MISO - pin 12, CLK - pin 13, CS - pin 10 #include <PZEM004Tv30.h> PZEM004Tv30 pzem(7, 8); #include <SD.h> const int chipSelect = 10; String inputString; boolean stringComplete = false; boolean doFlag = false; boolean closeFlag = false; boolean recFlag = false; long idx = 0; File myFile; void setup() { pinMode(SS, OUTPUT); Serial.begin(57600); // see if the card is present and can be initialized: if (!SD.begin(chipSelect)) { Serial.println("Card failed, or not present"); // don't do anything more: while (1) ; } Serial.println("I'm Ready"); } void loop() { while (Serial.available()) { // get the new byte: char inChar = (char)Serial.read(); if (inChar != '\r' && inChar != '\n') { inputString += inChar; stringComplete = true; } else { if (stringComplete) { Serial.println(inputString); if (inputString.equals("on")) { // Serial.println("on_ok"); doFlag = true; } else if (inputString.equals("off")) { // Serial.println("off_ok"); doFlag = false; closeFlag = true; } inputString = ""; stringComplete = false; } } } if (doFlag) { if ( recFlag == false) { Serial.println("card initialized."); char filename[] = "LOGGER00.TXT"; for (uint8_t i = 0; i < 1000; i++) { filename[6] = i / 10 + '0'; filename[7] = i % 10 + '0'; if (! SD.exists(filename)) { Serial.println(filename); myFile = SD.open(filename, FILE_WRITE); // only open a new file if it doesn't exist break; // leave the loop! } } if (myFile) { recFlag = true; } if (! myFile) { Serial.println("couldnt create file"); } } float voltage = pzem.voltage(); if (voltage != NAN) { Serial.print("Voltage: "); Serial.print(voltage); Serial.println("V"); } else { Serial.println("Error reading voltage"); } Serial.println(voltage); myFile.println(voltage); myFile.flush(); delay(2000); } else if (closeFlag) { Serial.println("gps recording stop"); recFlag = false; doFlag = false; closeFlag = false; myFile.flush(); myFile.close(); } }

but I would like to get a solution with UNO as I had invested around 50 of UNO only for this project.

Note: The Libraries eat a lot of Mem too so the UNO displays the warning of stability.

PZEM FORUM.zip (149 KB)

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Energy logger using PZEM004T and Arduino UNO+SD shield ver 1.0

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