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August 21, 2019, 10:02:59 10:02


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Author Topic: Inexpensive wireless voltage/current/watt-hour monitor  (Read 398 times)
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zac
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« on: July 25, 2019, 02:11:01 14:11 »

This device works fairly well.  Downsides are it doesn't include a dc-dc converter to self power from the high voltage input and the included radio transceiver has a range of about 1 meter (rather than the claimed 10)

https://www.ebay.com/itm/DC-500V-100A-200A-500A-Wireless-Voltmeter-Ammeter-Coulometer-Battery-Power-Meter/132928693409

But, it uses the nRF24L01 radio transceiver chip so the radio module can be swapped with this to extend the range to at least 100 meters:

https://smile.amazon.com/gp/product/B07GRMJJY5

If you know of a pin compatible drop-in replacement that works at lower frequency (915, 433, 315 mhz, etc.), please let me know. 
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dezso
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« Reply #1 on: August 02, 2019, 01:43:11 01:43 »

I got a few as well (3 in use), works great, just a few days ago managed to connect to with Arduino and now with Raspberry pi, planing to make a better GUI for all 3 in 1 3.5" pi display.
First I was snooping the SPI init to see hows the NRF24 gets initiated and whats being transmitted, got a lots of info, once I got the RX_ADDRESS the rest was easy with RF24 lib available for Linux Pi and Arduino
Code:
RX_ADDR_P0=89674523  -> 08 is the channel


The poor range is due to the fake cheap NRF chip and many missing component from the RF side, once I replaced it with a good quality module its works as expected.

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