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Title: Inexpensive wireless voltage/current/watt-hour monitor Post by: zac on July 25, 2019, 08:11:01 20:11 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. Title: Re: Inexpensive wireless voltage/current/watt-hour monitor Post by: dezso on August 02, 2019, 07:43:11 07:43 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. (https://i.postimg.cc/XJfXxNhJ/IMG-2865.jpg) (http://postimg.cc/N90gjtQq) Title: Re: Inexpensive wireless voltage/current/watt-hour monitor Post by: dezso on August 28, 2019, 06:53:36 18:53 If anyone playing with one of this I got mode commands for it so it can be controlled with pretty much anything.
Lats byte is checksum, basically the sum of all bytes last byte. ie: aa0568085a79 = aa+05+68+08+5a = 0x0179 = 79 Code: aa1c6a08001203e805dc03b600960000.06.0002080f6f6d870ee80ee8d3 relay on |