1 #207 Why most Arduino Soil Moisture Sensors suck (incl. solution)
Andreas Spiess explains why many cheap Arduino soil moisture sensors give poor readings and shows a fix; cited by people building or modifying capacitive sensor boards.
Channel
Andreas Spiess
13 recommended videos. Channel on YouTube
2 #58 ESP8266 Sensor runs 17 days on a coin cell/transmits data (deep-sleep)
Andreas Spiess builds an ESP8266 sensor that runs 17 days on a coin cell using deep sleep; a common starting point for battery-powered Wi-Fi sensor projects.
3 #47 Power Saving with ESP8266 (Sleep Mode) Tutorial with some Tricks
Andreas Spiess covers ESP8266 sleep modes and measures its current spikes; cited both for low-power design and for why the module needs decent supply capacitance.
4 #79 GPRS/GSM and GPS in one cheap module: The A7 from AI-Thinker
An overview of the cheap A7 GSM and GPS module, recommended when a project needs both mobile data and positioning on a budget.
5 #168 ESP32 Dual Core on Arduino IDE including Data Passing and Task Synchronization
Andreas Spiess explains running code on both ESP32 cores from the Arduino IDE, including passing data between tasks and keeping them in step.
6 #135 Radar Sensors / Switches: Comparison and Tests
Recommended for understanding cheap radar motion sensor modules, comparing several and testing how they behave as an alternative to PIR.
7 #69 M2M: TCP/IP to the Cloud over GPRS with the new A6 Module and info about the new A7 Module
Andreas Spiess walks through the cheap A6 GSM module, recommended for getting it powered, reset and talking over AT commands from an Arduino.
8 #101 Long lasting DIY "Amazon Dash Button" using an ESP8266
Recommended Andreas Spiess video on a MOSFET latch that lets a microcontroller hold its own supply on after a button press, then cut it off when finished.
9 #133 Safe Shutdown for Raspberry Pi with Super Capacitors
Andreas Spiess covers building a small battery backup that lets a Raspberry Pi shut down cleanly during a power cut, praised as a good overview of the challenges.
Hidden gem10 #39 SN-28B Chinese Crimper vs Engineer PA-09: Is there a difference for Dupont wires
Andreas Spiess compares crimpers and connector kits, recommended when choosing an affordable tool for making 2.54mm pin connectors.
11 #91 How to properly power the ESP8266 modules
Andreas Spiess works through powering an ESP8266 from a battery, covering the calculations involved, oscilloscope traces and adding a capacitor across the supply pins.
12 #386 How to measure low Currents for ESP/Arduino? Power Profiler, Otii, µCurrent Gold, Joulescope
Andreas Spiess compares tools for measuring tiny and pulsed currents, from the Nordic Power Profiler Kit II to the Joulescope; recommended when a multimeter misses ESP32 current spikes.
13 #287 Remote Controller for Clocks (IKEA and others, DCF77, WWVB, MSF, JJY)
Andreas Spiess builds a low-power transmitter that sets radio-controlled clocks via DCF77, WWVB, MSF or JJY; cited when people ask about emulating a time signal.
