Jason_25
Posts: 120
Joined: Tue Oct 20, 2015 6:25 pm

Wireless/wifi voltage monitor/battery monitor/ADC that works with Pi?

Sat Feb 17, 2018 6:13 pm

I am looking for a sensor that can be wirelessly read back from, preferably, a Raspberry Pi or other generic computer. Proprietary wireless will be ok too if the price is right. I am trying to read back the voltage on a car battery at about 150 feet range. Here is a review of what I have found so far:

Battery tender wireless battery monitor - https://www.autozone.com/test-scan-and- ... 240325_0_0 :
This uses an "app" which is a downside, it requires an internet connection to awkwardly upload the data to their cloud which is a downside, and it appears to not use wifi "master mode" which is the most obvious way of connecting to it, especially if you do not use wifi at home already.

Hummingbird Electronics wireless battery monitor - https://hmbe.com.au/rf-battery-monitor-kit :
Expensive and uses a proprietary wireless connection

Monnit Corporation wireless battery monitor - https://www.monnit.com/Product/MNS-9-W1-VM-050 :
Not widely available and there is no link to purchase on the site

Neulog wireless battery monitor - https://www.directfromvendor.com/index. ... rrency=USD :
Requires a wifi add-on and no information out there on how well it works

Something like this is ideal but is no longer available - it was available all the way back in 2008 - is this an example of technology getting worse over time? - https://www.google.com/search?q=wireles ... XE4c3062SM:

Heater
Posts: 13299
Joined: Tue Jul 17, 2012 3:02 pm

Re: Wireless/wifi voltage monitor/battery monitor/ADC that works with Pi?

Sat Feb 17, 2018 6:25 pm

Get yourself an ADC HAT like one of these: https://www.abelectronics.co.uk/product ... pi-a-b-2-3
I'm sure there are others around.

Configure your Pi as an access point.

Write a few lines of Python to read the ADC channels and log the data to files.

Better to put the data on a USB stick, to save any problems with file system corruption if the power fails.

mattmiller
Posts: 2106
Joined: Thu Feb 05, 2015 11:25 pm

Re: Wireless/wifi voltage monitor/battery monitor/ADC that works with Pi?

Sat Feb 17, 2018 8:57 pm

Might be worth while seeing if a Pi with a WiFi dongle (with an external antenna as I don;t think the on-board piZero/Pi3 will have the range) could reach from your battery to your building WiFi

(As someone else has said - a simple ADC board will sort out reading the battery volts)

tweak42
Posts: 500
Joined: Tue Mar 22, 2016 3:16 am
Location: Los Angeles, California

Re: Wireless/wifi voltage monitor/battery monitor/ADC that works with Pi?

Sun Feb 18, 2018 10:34 am

For something simple as measuring a sensor, have you considered using a wifi micro controller like a ESP8266? You also didn't say how much hacking you're willing to do, or are you searching for a finished product.

https://hilo90mhz.com/esp8266-battery-monitor/
https://www.hackster.io/jamin/blynk-power-meter-cf2d3e

Adafruit has a few linked tutorials to the INA219 they sell.
https://www.adafruit.com/product/904

Raspberry Pi INA219 Tutorial
https://www.rototron.info/raspberry-pi-ina219-tutorial/

Jason_25
Posts: 120
Joined: Tue Oct 20, 2015 6:25 pm

Re: Wireless/wifi voltage monitor/battery monitor/ADC that works with Pi?

Tue Feb 20, 2018 9:54 am

The problem with using the Pi as the "transmitter" is it would run even a huge deep cycle car battery down in a week or so. It would need it's own power station. I need something that is actually efficient. *shots fired*. I still have plans to try to use one as the "receiver" located indoors though.

I decided to go with a solar charge controller with an industry standard data output:
https://www.amazon.com/EPEVER-Charge-Co ... 5G40G019S5

Combined with a RS485 cable:
https://www.amazon.com/SolarEpic-Batter ... BSZGAM6J1G

and a compatible RS485 > wifi bridge:
https://www.amazon.com/ZHC-Monitor-Wire ... wifi&psc=1

This is actually cheaper and probably more reliable than rigging up a Pi to do this. I already have a 35w solar panel to go along with it. The biggest problem is still going to be the wifi range but this still seems like the best option.

I would like to keep the wifi bridge in access point mode because I don't have a home network. I am not sure if it is going to let me connect to it this way with a Pi or generic computer or not. The tutorials I have seen suggest the bridge may need to be set into a client mode which I am not willing or able to do. Ultimately if I set this up and only Android works I will be disappointed but will probably keep it anyway.

Alienkidmj12
Posts: 1
Joined: Tue Aug 28, 2018 5:17 pm

Re: Wireless/wifi voltage monitor/battery monitor/ADC that works with Pi?

Tue Aug 28, 2018 5:19 pm

Did this solution work. I'm trying to do something similar in a vw passat. Ie read battery levels etc wirelessly.

mosespi
Posts: 508
Joined: Mon May 12, 2014 3:35 pm
Location: 34,-118
Contact: Website

Re: Wireless/wifi voltage monitor/battery monitor/ADC that works with Pi?

Thu Aug 30, 2018 6:35 pm

I have a UPS that you can use that will do this. It has input voltage and battery ADCs. There are an 4 additional ADC too.
If you hook it up to the car it will read the bus voltage on it's input ADC. http://www.allspectrum.com/mopower/

The UPS also has the ability to power up the Pi on a timer.. so you can set it to power up, report and shut down every so often to save battery power. I do this for a similar vehicle setup.. It powers up once every 30 minutes for about a minute or so, then shuts off. The idle power consumption of the setup is about 0.25mA, so pretty low. I have had no trouble with the battery.

The input to the UPS was designed with vehicle power in mind and includes an automotive grade TVS (transient voltage suppressor).

Good luck with your project.

Regards,
-Moses
Power problems? MoPower UPS for the Pi
http://www.allspectrum.com/mopower/

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