RFID KeyPad Keyboard

I made a thing – it’s useful for me but probably not for you 🙂

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Build Your Own RS485 to Wifi Adapter for EPEver Solar Charge Controllers

Many EPEver solar charge controllers have an RS485 communication port on them so you can connect a PC or Android device and read it’s statistics or update the settings. Continue Reading →

Battery Evenness Tester Attempt 2

I still want to see if my battery bank discharges and charges evenly. So with version 2 of the code and a replacement module (and a theory or two about why it didn’t work last time), it’s time for a second attempt.

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Measuring Current with the ACS712

I wanted to dust off my Arduino IDE and throw some code together to test my battery bank which as usual I’ve posted on YouTube. I’m not so sure I’ve got the current measuring code quite right though.

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Dual USB Power Monitor

I picked this dual USB power monitor up on Ebay and made a video about it. Which turned into two videos, and now a couple of extra pictures.

Video 1

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ESP8266 PWM High Power LED Dimmer

I was grateful to receive a package in the post from one of my subscribers. It contained everything I needed to build an LED PWM Dimmer circuit using an ESP8266-ESP01.

I used some code from Sparkfun as the basis of the code below and just made a few changes so that I could dim the LED rather than just turn it on and off.

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Constant Current DC Load Part 6

This version of the code is working – it does however need improving. The analog value readings are a little off.

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Constant Current DC Load Part 3

Below is the code for the early version of my arduino constant current load – it is worth noting this isn’t a working version as yet.

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Lithium Ion 18650 Battery Capacity Checker

I created this fairly simple circuit and Arduino sketch to check the labeled capacity of Lithium Ion 18650 batteries. It could easily be adapted to other types of batteries and discharge more than one battery at a time. If you power your arduino from a computer and monitor the serial port you can obtain results as it goes along and create pretty graphs of the results. http://admw.uk/iB

The Code…
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