95 lines
3.4 KiB
Markdown
95 lines
3.4 KiB
Markdown
the spark counter is a custom electricity meter with wireless data logging capability.
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on one side I have:
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* peacefair PZEM-004 power meter to measure the electricity consumption
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* ATmega328P micro-controller to read the measurements out
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* nRF24L01+ radio to transmit the values
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on the other side:
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* nRF24L01+ radio to receive the values
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* Raspberry Pi single board computer to store the measurements in an influxDB time series database
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* grafana graphical monitoring tool to display the electricity consumption
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more information is available in the [wiki](https://wiki.cuvoodoo.info/doku.php?id=spark_counter).
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arduino_nano
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============
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Arduino Nano firmware for the remote power meter side of the spark counter.
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the source files are written in C and intended for the Atmel ATmega328P micro-controller.
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This does not use the Arduino IDE.
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It requires avrdude and avr-libc.
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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`).
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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.
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The destination address and channels for the radio communication can be set in EEPROM.
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The format is the following:
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- 4 bytes source address
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- 4 bytes destination address
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- 1 byte channel number
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- 1 byte CRC8-ibutton checksum over the previous data
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The default values are defined in `main.h` but will be overwritten by the raw EEPROM data in `eeprom.bin`.
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Don't forget to use `make eeprom` to write the configuration data on the micro-controller.
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The source code is interrupt driven when possible (timers, USART, SPI, nRF24 IRQ).
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Arduino - nRF24L01+ connection
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------------------------------
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ATmega328P signal,ATmega328P pin,Arduino Nano pin,nRF24L01+ board pin,nRF24L01+ signal
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GND,GND,GND,1,GND
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,3V3 (add cap.),2,VCC
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I/O,PB1,D9,3,CE
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SS,PB2,D10,4,CSN
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SCK,PB5,D13,5,SCK
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MOSI,PB3,D11,6,MOSI
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MISO,PB4,D12,7,MISO
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INT0,PD2,D2,8,IRQ
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rpi
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===
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Raspberry Pi program for the computer side of the spark counter.
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the source files are written in C and require the [RF24 library](https://tmrh20.github.io/RF24/RPi.html) for the nRF24L01+ radio transciever and libcurl to save the measurement data in the influxdb time series database.
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on the Raspberry Pi the [raspian](https://www.raspberrypi.org/downloads/raspbian/) OS is installer and the bcm2835 SPI kernel module is enabled (through `rasp-config`).
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connect to nRF24L01+ to the SPI port of the Raspberry Pi and set up an influxdb database.
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note
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----
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if you see the following error while compiling the RF24 eamples:
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error: ‘sleep’ was not declared in this scope
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add the folling line to the corresponding source file:
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#include <unistd.h>
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error seen in `gettingstarted.cpp`, `gettingstarted_call_response`, and `transfer.cpp`
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RPi - nRF24L01+ connection
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--------------------------
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RPi signal,RPi pin,nRF24L01+ board pin,nRF24L01+ signal
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GND,P1_20,1,GND
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+3V3,P1_17,2,VCC
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GPIO25,P1_22,3,CE
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GPIO8/CE0#,P1_24,4,CSN
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GPIO11/SCLK,P1_23,5,SCK
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GPIO10/MOSI,P1_19,6,MOSI
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GPIO9/MISO,P1_21,7,MISO
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GPIO24,P1_18,8,IRQ
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pzem-004_probe.rb
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=================
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a simple script to query measurement values from the peacefair PZEM-004 power meter.
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connect the power meter UART port using a USB to UART converter.
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TODO
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====
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rpi:
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- provide influxdb hostname, username, and password as parameter
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