A Scope In A Pinch

A Scope In A Pinch

When working with device electronics, it’s important to work within voltage and signal limits. Designing circuits that interact with those devices need to have expected results. There can be several stages in a circuit design where voltages or signals are changed. It can be extremely challenging to design without some kind of measurement at each stage. Having a tool that can measure multiple stages at the same time in realtime is key. Fortunately, this can be done for little cost…

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Wemos 433 Mhz RF Receiver

Wemos 433 Mhz RF Receiver

I’ve been using RTL_433 with a SDR for a few years now with modest success. This setup will detect and identify a variety of 433Mhz sensor readings. The output is piped to a MQTT broker and from there the readings are presented graphically. At first this was done on a Raspberry Pi running a bash script on startup, with the following one liner command. rtl_433 -F json | mosquitto_pub -h <MQTT-Broker> -i RTL_433 -l -t RTL_433/SDR_FEED Unpredictably, problems would arise…

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Wemos in a Pelonis

Wemos in a Pelonis

This post will cover the use of the ESP8266 clone form factor of the more popular Wemos D1 Mini. This clone development module has the same pinout and interfaces as the Wemos D1 Mini. The Arduino IDE was set to use the NodeMCU 1.0 ESP12E Module for the code below, although the LOLIN(WEMOS) D1 mini (clone) was avaliable. This board selection didn’t present any issues when loading the firmware. The board is inexpensive, a 10 pack can run around $25….

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