I often get questions about how to measure voltage with microcontrollers. We will look at this topic, at the quality of built-in and external Analog-to-digital converters, and I will show you some “secrets.” In this video, we will: - See how ADCs work - Look at how we can determine the quality of ADCs - Compare the ADCs of different microcontrollers with external chips - Learn how to tweak the calculations to get the best out of any ADC - See how we can extend the range of ADCs - Discover some “hidden” things of Microcontrollers and their ADCs - Look at different external boards and their usage I am a proud Patreon of GreatScott!, Electroboom, Electronoobs, EEVblog, and others. Links: ESP32 dev board: http://s.click.aliexpress.com/e/_dZRlwBw ESP32 Breakout: http://s.click.aliexpress.com/e/_dYPpD2c ADS1115: http://s.click.aliexpress.com/e/_d9kxGU8 PCF8591: http://s.click.aliexpress.com/e/_dTanrOc AD7705: http://s.click.aliexpress.com/e/_d6fDmrw Nice looking ADC (AD7606): http://s.click.aliexpress.com/e/_dYHWm0A Voltage reference: http://s.click.aliexpress.com/e/_d6N3GHc Voltage Divider: http://www.ohmslawcalculator.com/voltage-divider-calculator ADC Theory: https://e2e.ti.com/blogs_/archives/b/precisionhub/archive/2014/10/07/adc-accuracy-part-1-is-accuracy-different-from-resolution DAC Theory: https://en.wikipedia.org/wiki/Digital-to-analog_converter The links above usually are affiliate links which support the channel (no additional cost for you). Supporting Material and Blog Page: http://www.sensorsiot.org Github: https://www.github.com/sensorsiot My Patreon Page: https://www.patreon.com/AndreasSpiess Discord: https://discord.gg/JfgDSa8 If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission (of your purchases the next 24 hours) to buy new stuff for the channel My Amazon.com shop: https://www.amazon.com/shop/andreasspiess For Banggood https://bit.ly/2jAQEf4 For AliExpress: http://bit.ly/2B0yTLL For Amazon.de: http://amzn.to/2r0ZCYI For Amazon UK: http://amzn.to/2mxBaJf For ebay.com: http://ebay.to/2DuYXBp https://www.facebook.com/profile.php?id=100013947273409 https://twitter.com/spiessa https://www.instructables.com/member/Andreas%20Spiess/ Please do not try to Email me or invite me on LinkedIn. These communication channels are reserved for my primary job As an Amazon Associate, I earn from qualifying purchases ... https://www.youtube.com/watch?v=UAJMLTzrM9Q

In this video we will connect Sonoffs, PIR sensors and Alexa to a Raspberry Pi Mosquitto MQTT broker. The "brains" is Node-Red and we will do some cool stuff like some Java Script, audio output, and SQLite. Standard username/password: admin/admin and user/user Links: http://www.sensorsiot.org/diet-pi-supporting-material-videos-126-and-128/ Peter Scargill’s Script: http://tech.scargill.net/a-christmas-script/ Article about Node-Red variables: https://tech.scargill.net/node-red-global-flow-and-context/ USB Ethernet Adapter: https://www.aliexpress.com/item/Hot-Brand-Micro-USB-to-Network-LAN-Ethernet-RJ45-Adapter-with-3-Port-USB-2-0/32691036545.html Commands: sudo wget http://www.scargill.net/iot/index.html -O /var/www/html/index.html sudo wget http://www.scargill.net/iot/reset.css -O /var/www/html/reset.css If you want to support the channel and buy from Banggood use this link to start your shopping: https://bit.ly/2jAQEf4 (no additional charges for you) https://www.facebook.com/Andreas-Spiess-733189426841519/ https://twitter.com/spiessa The Sonoffs use ESP8266 chips ... https://www.youtube.com/watch?v=YahFRqf-rFA