How to Use 5 Volt Relay Modules with Arduino and ESP8266

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=nMgvKgqA0JI

Taking a look at an opto isolated relay module and examining how it works: • -what does the control circuit look like? • -what is the rating on the relays, what voltages are required to use it? • -how can we use it with a PCF8574 gpio expander to use up to 8 relays per expander from the I2C bus if we don't have enough pins? • -can we run it at both 5V and 3.3V for modules that only support 3.3V? (both direct control and through the PCF8574) • -how simple is it to use a PCF8574 Arduino library to control the relays and read in buttons with the gpio expander? • -gotcha: making sure the relay module is properly configured for isolation if that is a desired use case. Just having opto isolators on board isn't all that's required • 8 channel relay module Amazon affiliate link: • Amazon.com: https://amzn.to/2ldR8LB • Amazon.ca: https://amzn.to/2ldSEgL • Sketch and Schematic: • https://github.com/GadgetReboot/Ardui... • Datasheets: • http://www.ti.com/lit/ds/symlink/pcf8... • https://www.espressif.com/sites/defau... • Fritzing part for 4 relay module: • https://timgolisch.wordpress.com/2015... • Support the channel by using these affiliate links to check out Banggood's sale on Tools Electronics this month (2021 4.07 - 4.18) : • Banggood hot brand tools https://bit.ly/3dSyO2l • Electronic Brand Sale https://bit.ly/2PHpeau • Creality 7th Anniversary Sale https://bit.ly/3d0fLUi • Note: If you make a purchase through my affiliate links, I will earn a small commission which helps the channel but doesn’t cost you anything extra. • Support me on Patreon: / gadgetreboot • #ElectronicsCreators

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