the spark counter is a custom electricity meter with wireless data logging capability.

on one side I have:

• peacefair PZEM-004 power meter to measure the electricity consumption
• ATmega328P micro-controller to read the measurements out
• nRF24L01+ radio to transmit the values

on the other side:

• nRF24L01+ radio to receive the values
• Raspberry Pi single board computer to store the measurements in an influxDB time series database
• grafana graphical monitoring tool to display the electricity consumption

more information is available in the wiki.

arduino_nano

Arduino Nano firmware for the remote power meter side of the spark counter.

the source files are written in C and intended for the Atmel ATmega328P micro-controller. This does not use the Arduino IDE. It requires avrdude and avr-libc.

Connect the peacefair PZEM-004 power meter to the UART port of the Arduino Nano and the nRF24L01+ radio transceiver to the SPI port (detailed information in nrf24.h). The spark counter firmware will periodically read the measurement values from the power meter (voltage, current, power, energy) and send them using the radio transceiver.

The destination address and channels for the radio communication can be set in EEPROM. The format is the following:

• 4 bytes source address
• 4 bytes destination address
• 1 byte channel number
• 1 byte CRC8-ibutton checksum over the previous data The default values are defined in main.h but will be overwritten by the raw EEPROM data in eeprom.bin. Don't forget to use make eeprom to write the configuration data on the micro-controller.

The source code is interrupt driven when possible (timers, USART, SPI, nRF24 IRQ).

Arduino - nRF24L01+ connection

ATmega328P signal,ATmega328P pin,Arduino Nano pin,nRF24L01+ board pin,nRF24L01+ signal GND,GND,GND,1,GND ,3V3 (add cap.),2,VCC I/O,PB1,D9,3,CE SS,PB2,D10,4,CSN SCK,PB5,D13,5,SCK MOSI,PB3,D11,6,MOSI MISO,PB4,D12,7,MISO INT0,PD2,D2,8,IRQ

rpi

Raspberry Pi program for the computer side of the spark counter.

the source files are written in C and require the RF24 library for the nRF24L01+ radio transciever and libcurl to save the measurement data in the influxdb time series database.

on the Raspberry Pi the raspian OS is installer and the bcm2835 SPI kernel module is enabled (through rasp-config).

connect to nRF24L01+ to the SPI port of the Raspberry Pi and set up an influxdb database.

note

if you see the following error while compiling the RF24 eamples: error: ‘sleep’ was not declared in this scope add the folling line to the corresponding source file: #include <unistd.h> error seen in gettingstarted.cpp, gettingstarted_call_response, and transfer.cpp

RPi - nRF24L01+ connection

RPi signal,RPi pin,nRF24L01+ board pin,nRF24L01+ signal GND,P1_20,1,GND +3V3,P1_17,2,VCC GPIO25,P1_22,3,CE GPIO8/CE0#,P1_24,4,CSN GPIO11/SCLK,P1_23,5,SCK GPIO10/MOSI,P1_19,6,MOSI GPIO9/MISO,P1_21,7,MISO GPIO24,P1_18,8,IRQ

pzem-004_probe.rb

a simple script to query measurement values from the peacefair PZEM-004 power meter. connect the power meter UART port using a USB to UART converter.

TODO

rpi:

• provide influxdb hostname, username, and password as parameter