spark_counter
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spark_counter [2016/10/04 21:23] – [Orange Pi] moved to spark abacus 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 wires power distribution systems. I have a 3 phases | + | **warning: the electricity meter I am presenting will only work for 1-phase 2-wire power distribution systems. I have a 3-phase |
====== peacefair PZEM-004 ====== | ====== peacefair PZEM-004 ====== | ||
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The {{: | The {{: | ||
The UART configurations is 9600 bps 8N1. | The UART configurations is 9600 bps 8N1. | ||
- | All commands include a device address (i.e. C0 A8 01 01 = 192.168.1.1). | + | You have to set the device' |
- | Only the device with the specified address will respond. | + | This address will be saved so the next time (even after power down) you can directly query measurements using the address(es) set in the device(s). |
- | This allows to query multiple devices on the same UART port, one after another, when they have different addresses. | + | All commands include the target device address and only the device with the specified address will respond, except for the command setting the address in the first place. |
- | Thus you have to set the device' | + | This allows to query multiple devices connected to the same UART port, one after another, when they have different addresses. |
- | This address will be saved so the next time (even after power down) you can directly query measurements using the address(se) set in the device(s). | + | 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:// |
spark_counter.1475616186.txt.gz · Last modified: 2024/01/07 17:49 (external edit)