Programming Power Fail Logger with Arduino IDE

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Test the connectivity from the programmer to the Power Fail Logger board

 Using AVRDUDE validate the USBTiny is communicating with the Power Fail Module Microcontroller
 Connect the USBTinyISP to the AVR-ISP-6 pin header J7 on the Power Fail Logger PCB .
 On laptop using Windows CMD terminal type the following. Make sure you are in the AVRDude directory.
 avrdude -c usbtiny -p m328p -v
For more information about using AVRDude refer back to this link 
 ==AVRDUDE Class==

Connect Serial Port to the RS232 Port

 Plug into your laptop USB port the Prolific USB-to-Serial Comm Port 
 Connect the Prolific USB-to-Serial Comm Port to the RS232 Port on the Power Fail Board 
 Connect the TX, RX, and Ground Pins to J4.
         Prolific         J4 Power Logger
             TX      -    RX
             RX      -    TX
             GND     -    GND
 Use Windows Device Manager to validate which Comm Port is used. You will need this later.

Set up the Arduino IDE

 Connect the USBTinyISP to the AVR-ISP-6 pin header J7 on the Power Fail Logger PCB.
 Select your Programmer.
 In the Arduino IDE click on Tools Tab - Select Programmer then select USBTinyISP.
Select your comm Port. In the Arduino IDE click on Tools Tab - Select Port then select the comm-port that is using the Prolific Port Select the correct target board. In the Arduino IDE click on Tools Tab - Select Board then select the Arduino Uno.

Validate the Arduino IDE has the following libraries installed before proceeding with the flash process.

#include <Wire.h>                   // For I2C Interface SDA SCK.
#include <ds3231.h>                 // For the DS3231 RTC library.
#include <SPI.h>                    // SPI Interface that the SD card module will use.
#include <SD.h>                     // For the SD card. 

Flash the Microcontroller with Power-Fail-Logger Program

 Paste the program below Power-Fail-Logger Program.ino into the Arduino IDE.
 In the Arduino IDE click on Sketch Tab - Select Upload Using Programmer

 /* Power_Fail_Logger.ino Jim Merkle and Rusty Cain  
  * Copyright 4-12-2021
 #include <Wire.h>                   // For I2C Interface SDA SCK
 #include <ds3231.h>                 // For the DS3231 RTC library
 #include <SPI.h>                    // SPI Interface that the SD card module will use
 #include <SD.h>                     // for the SD card
 const int chipSelect = 4;           // Set Chip Select for SD card read/write
 File myFile;                        // Create a SD file to store the data
 // our state values
 #define POWER_NORMAL 0              // power has been good a long time
 #define POWER_GONE   2              // Where's the power?????
 #define POWER_UP  1
 #define POWER_OFF 0
 #define POWER_BAD_COUNT 3
 #define POLL_NORMAL  5000           // 5000 ms = 5 seconds
 #define POLL_BAD     5000           // 5000 ms = 5 seconds
 int Vresistor = A0;                 // A0 Pin on Arduino used to sample the power. 
                                     // Either +5 Volts (1023) or 0 volts (0) 
 struct ts t;
 int currentpower = POWER_UP;        //currentpower is the value used to check power status
 char time_as_text[80];              // build strings into this buffer
 void setup() {
 // Setting up system
 Serial.begin(9600);               // Start the Serial print for use with Serial monitor
 while(!Serial );                  // Wait for process to start 
 Wire.begin();                     //Start the I2C interface. Pins A5 and A4
 //  int number;                     // variable for the print2functions - needs to be removed
                                   // Initialize the RTC.
                                   // Print start up status for system to Console monitor
 Serial.println("POWER Logger Copyright 2021");
 gettime();                        //Read RTC DS3231 and display on Console Monitor
   Serial.print("\nInitializing SD card...");
                                   //  Check the SD card is there before writing to it 
   if(!SD.begin(chipSelect)) {
     Serial.println("initialization failed!");
                                   // "initialization done."
                                   //open file to record how many time it has rebooted"Reboots.txt", FILE_WRITE);   
   if (myFile) {                   // if the file opened ok, write to it:
                                   // Reboots.txt File opened ok
                                   //Writes "System Rebooted and gets time stamp.
       myFile.print("System Rebooted "); 
       myFile.close();             // Closes file Reboots.txt
     Serial.println("Setting up logging time");
                                 //   gettime(); //Remove ??
                                   // Return POWER_UP: for power OK, POWER_OFF: power gone
                                   // Initial power state and period values
 int powerstate = POWER_NORMAL;
 int pollperiod=POLL_NORMAL;
 int powerbadcount=0;
 void loop() {
  currentpower = checkpower();    //Check Power status and read value from A0
                                  // Power Logging State Machine
 switch(powerstate) {
     case POWER_NORMAL:
                                  // Power is good
       if(currentpower == POWER_UP)
         break;                  // do nothing
                                 // we read a bad power reading, transition to POWER_GONE
       powerstate = POWER_GONE;
       pollperiod = POLL_BAD;
       Serial.println("Transition to POWER_GONE");
                                 //Serial.print("Power Unstable: ");
       case POWER_GONE:
       if(currentpower == POWER_UP) {
                                 // transition to power good
         powerstate = POWER_NORMAL;
         pollperiod = POLL_NORMAL;       
         Serial.println("Transition to POWER_NORMAL");
         Serial.print("Power Restored: ");
   }                             // end of switch state machine
   delay(pollperiod);            // sleep(pollperiod); // 1s
 }                               // end loop()
 void gettime() {       
 sprintf(time_as_text,"Date : %02u/%02u/%u    Time : %02u:%02u:%02u",
  // This Function Reads RTC and gets current time and Date then converts to text string. 
  // DS3231_get(&t); Call to DS3231 library and reads the RTC 
  // Serial.println(time_as_text); Prints the converted String data from the RTC.
 int checkpower()                          //Check Power status and read value from A0
 int rawpower = analogRead(Vresistor);   // check Power at Pin A0 
 // check
 if(rawpower > 250) {
   Serial.println("Power Good ");
   return POWER_UP;
 else {
   Serial.println("Power Failure: ");
      return POWER_OFF;
 void Logging() {
  myFile ="DATALOG.txt", FILE_WRITE); // opens the file DATALOG, which is the text file, for writing the Pot value.
 if (myFile) {
 if (currentpower == POWER_UP) {
   Serial.println("Power Good");               // Print Power Good to Console monitor
   myFile.print("Power Good   : ");            // Print Power Good to SD Card
 else {  
 Serial.println("Power Failure");            // Print Power Failure to Console monitor
 myFile.print("Power Failure: ");            // Print Power Failure to SD Card
 //sprintf(time_as_text,"Date : %u/%u/%u    Time : %u:%u:%u",
 Serial.println("Data written:");

Validate the Power-Fail-Logger Program is running

 After program has uploaded   Validate 
 In the Arduino IDE click on Tools Tab - Select Serial Monitor
Once the program has finished loading hit the Reset button on the Power Fail Logger Board. You should see the program running in the display of the Serial Monitor. Unplug USBTiny Programmer Remove Jumper from J8

Next Step: Installation and use. Click on link below

Power Fail Logger by Microrusty

Initializing the Microcontroller

Setting Time and Date for the DS3231 RTC

Programming Power Fail Logger with Arduino IDE

Installation and use

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