M0AGX / LB9MG

Amateur radio and embedded systems

  • NodeMCU as a standalone thermometer

    I finally completed work on my networked thermometer. I got some old 7Ah 5-cell NiCd battery packs from emergency lighting fixtures that will power the device. I wonder how long can they last. NiCd batteries suffer from high self-discharge rates, on the other hand the NodeMCU will sleep most of …

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  • B6AC battery charger teardown

    I recently got some discarded NiCd batteries from emergency lighting fixtures (5 cells, 7 Ah) and I started looking for a way to check if they might still work. While searching for chargers I found model B6AC that charges automatically almost any battery chemistry (various lithium, NiCd, NiMH, lead-acid), can …

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  • NodeMCU networked thermometer

    In the last post I made a short introduction on development using the NodeMCU platform with a simple reading of a 1-wire thermometer. This time I will show how to make a basic networked application for the NodeMCU and the server part for a computer to gather some useful data …

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  • First steps with NodeMCU

    nodemcu1

    NodeMCU is a versatile board with the WiFi-enabled ESP8266 system-on-chip, USB to UART bridge, voltage regulator and some auxiliary components. With a price tag of about $9 on Aliexpress it allows you develop your own Internet "things" literally in minutes.

    The killer part is a build-in Lua interpreter, so no …

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