spark_counter
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spark_counter [2015/12/08 16:27] – [Orange Pi] kingkevin | spark_counter [2024/01/07 17:49] (current) – external edit 127.0.0.1 | ||
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+ | **warning: the electricity meter I am presenting will only work for 1-phase 2-wire power distribution systems. I have a 3-phase 4-wire system and I was doing it wrong. This has been fixed with the [[spark abacus]].** | ||
====== peacefair PZEM-004 ====== | ====== peacefair PZEM-004 ====== | ||
- | The [[http:// | + | The [[https:// |
It: | It: | ||
* measures voltages 80-260 V AC | * measures voltages 80-260 V AC | ||
Line 35: | Line 37: | ||
{{: | {{: | ||
- | The meter also provides a UART port to query the measured values. | + | The meter also provides a UART port (using an XH-4P connector) |
Two opto-couplers isolate the main power meter circuits from the TX and RX UART ports. | Two opto-couplers isolate the main power meter circuits from the TX and RX UART ports. | ||
+ | |||
+ | ^ UART ^ PZEM-004 ^ note ^ | ||
+ | | 5V | VDD | 3.3V is not enough | | ||
+ | | TX | RX | the UART pin needs to be able to sink ~4 mA | | ||
+ | | RX | TX | the UART pin needs to be idle high | | ||
+ | | GND | GND | | | ||
+ | |||
+ | I used a CP2102 based USB to UART converter. | ||
+ | CH340 based USB to UART converters will not work (it seems to not be able to sink enough current). | ||
+ | And when using the Arduino you should not use the USB port (for serial), since that interferes with the UART signals. | ||
The {{: | The {{: | ||
The UART configurations is 9600 bps 8N1. | The UART configurations is 9600 bps 8N1. | ||
- | Before querying the measurements, | + | You have to set the device' |
- | Else it won't reply to the other commands. | + | This address will be saved so the next time (even after power down) you can directly query measurements using the address(es) |
- | The manual uses an IP as address (192.168.1.1 | + | All commands include the target device address and only the device with the specified address will respond, except |
- | No idea why you would set an IP for a UART address. | + | This allows to query multiple devices connected to the same UART port, one after another, when they have different addresses. |
+ | Note: the optocouplers on the Tx pin of the device have a pull-up resistor. Be sure to remove all but one when using multiple devices, else the low value of the signal will be too high for the receiver to decode the serial communication. | ||
The commands use the following 7 bytes message format: | The commands use the following 7 bytes message format: | ||
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I removed the pizeo-element to prevent this annoying sound. | I removed the pizeo-element to prevent this annoying sound. | ||
- | {{: | + | {{: |
- | {{: | + | {{: |
- | {{: | + | |
The power meter uses a single chip solution, the [[http:// | The power meter uses a single chip solution, the [[http:// | ||
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USART to query the power meter, SPI to communicate with the nRF24L01+, and the nRF24L01+ protocol are implemented in C (using a lot of interrupts). | USART to query the power meter, SPI to communicate with the nRF24L01+, and the nRF24L01+ protocol are implemented in C (using a lot of interrupts). | ||
- | The source code is available [[https:// | + | The source code is available [[https:// |
I prefer directly writing in the registers as described in the [[http:// | I prefer directly writing in the registers as described in the [[http:// | ||
This way I learn how it works in details. | This way I learn how it works in details. | ||
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On the [[# | On the [[# | ||
- | The source code is available [[https:// | + | The source code is available [[https:// |
On the [[# | On the [[# | ||
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To receive the measurements I used a [[# | To receive the measurements I used a [[# | ||
- | The source code is available [[https:// | + | The source code is available [[https:// |
[[http:// | [[http:// | ||
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{{: | {{: | ||
- | ====== Orange Pi ====== | ||
- | |||
- | The [[http:// | ||
- | This single board computer is based on an [[https:// | ||
- | |||
- | For this price the hardware is unbeatable, but the software support is really poor. | ||
- | Also only Android supports the video hardware acceleration currently. | ||
- | The official [[http:// | ||
- | * such as [[http:// | ||
- | * various [[http:// | ||
- | Since I'll only use it as server I decided to go with debian jessie minimal. | ||
- | The pin header is the same as the [[http:// |
spark_counter.txt · Last modified: 2024/01/07 17:49 by 127.0.0.1