ESP Hardware

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This is a (not yet complete) list of Hardware which is known to be supported:

Device Name ESP Chip Flash Size USB-TTL GPIOs available
(red=not recommended use due to possible problems)
GPIO connected to onboard Hardware onboard PSU/voltage regulator Input voltage Antenna Size (LxWxH)
12 E/F 4MB CH340 0, 1, 2, 3, 4, 5, 9, 12, 13, 14, 15, 16, A0 (with Voltage divider) 1&3 (serial) RT9013 5 VDC (+/-0,5V) onboard PCB 34.2mm x 25.6mm x ?mm
12 E/F 16MB CP2104 0, 1, 2, 3, 4, 5, 9, 12, 13, 14, 15, 16, A0 (with Voltage divider) 1&3 (serial) RT9013 5 VDC (+/-0,5V) onboard ceramic/pigtail connector 34.2mm x 25.6mm x ?mm
WeMos D1 R2

Wemos d1 r2.jpg

12 E/F 4MB CP340G 0, 1, 2, 3, 4, 5, 9, 12, 13, 14, 15, 16, A0 (with Voltage divider) 1&3 (serial) 9-24VDC Switching power supply to 5 VDC(@1A) and RT9013 9-24VDC (power jack), 5VDC (5V pin) onboard PCB 68.6mm x 53.4mm x ?mm (=Arduino UNO)
12 E 4MB CP2102 0, 1, 2, 3, 4, 5, 9, 12, 13, 14, 15, 16, A0 (with Voltage divider) 1&3 (serial)  ? 5 VDC (+/-0,5V) onboard PCB  ?mm x ?mm x ?mm
12 E 4MB CP340 0, 1, 2, 3, 4, 5, 9, 12, 13, 14, 15, 16, A0 (with Voltage divider) 1&3 (serial)  ? 5 VDC (+/-0,5V) onboard PCB  ?mm x ?mm x ?mm
generic ESP8266 1MB None 1, 3, (14) 0 (button), 12 (Relay 10A@230VAC), 13 (LED) on board mains AC to 5DVC + ? 3.3V Voltage Regulator
Attention! The DC power is NOT galvanically decoupled from AC power!
90-250VAC onboard PCB 88mm x 38mm x 23mm
Sonoff TH10/TH16

Sonoff th.jpg

generic ESP8266 1MB None 1, 3, (14) 0 (button), 12 (Relay 10A/16A@230VAC), 13 (LED), 14 (AM2301) on board mains AC to 5DVC + ? 3.3V Voltage Regulator
Attention! The DC power is NOT galvanically decoupled from AC power!
90-250VAC onboard PCB 88mm x 38mm x 23mm
Sonoff S20

Sonoff S20.jpg

generic ESP8266 1MB None 1, 3, (14) 0 (button), 12 (Relay 10A@230VAC), 13 (LED) on board mains AC to 5DVC + ? 3.3V Voltage Regulator 90-250VAC onboard PCB  ?
Sonoff 4ch

Sonoff-4ch.jpg

generic ESP8285 1MB None 2, (7, 8) 0, 9, 10, 14 (Buttons), 4 , 5, 12, 15 (Relay 10A@230VAC), 13 (LED blue) on board mains AC to 5DVC buck converter + 3.3V Voltage Regulator 90-250VAC onboard PCB 145mm x 90mm x 41mm
generic ESP8285 1MB None - 0 (button), 12 (Relay 2A@230VAC), 13 (LED blue) on board mains AC to 5DVC buck converter + 3.3V Voltage Regulator 90-250VAC onboard PCB 86mm x 86mm x 37mm (EU)
120mm x 78mm x 41mm (US)
generic ESP8285 1MB None 0, 9, 10, 14 4 , 5, 12, 15 (Relay 10A@230VAC), 13 (LED red) powered by 7-32V or USB (5V) 90-250VAC onboard ceramic 75mm x 75mm x 18mm
generic ESP8285 1MB None - 12 (Relay 10A@230VAC), 13 (LED red) powered by 5V or USB (5V) 90-250VAC onboard ceramic 30mm x 70mm x 18mm
Ai-Thinker A20 Breakout

Ai-thinker a20.jpg

generic ESP8285 1MB None  ?  ?  ?  ? SMA Connector  ?


Power for your ESP

Power Supplies

Do yourself a big favour: Avoid cheap power supplies!

We have seen some strange behaviour from cheap power supplies. If you put a voltmeter on these it shows the correct voltage. Everything looks nice.

If you use an oscilloscope you may get some nasty surprises. Oscillating voltage, ripples.....

Use a high quality power supply like MeanWell or similiar. It should have at least a current of 1..2 ampere.

USB Cables

If you are using a nodeMCU, a WeMos or another USB-powered module, be aware of using good quality USB cables. Cheab cables use really thin wires. For transfering data and some milliampere of current these are ok. For an ESP module they possibly are too weak. Voltage drops and some warm boot occurs.

As a rule of thumb: Use USB cables as thick and as short as possible. If you receive warm boots for no obvious reason try a capacitor of at least 470µF from 3.3V to ground as near to the module as possible.

A good power supply is recomended anyways as USB power from the computer is always limited. Do not use the micro USB port for anything but flashing and lab tests. Use Vin instead (on WeMos D1 mini the port is simply labeled "5V").

Checking Voltage

If you need to check voltage the first step is a good quality voltmeter or multimeter. Whereever possible put the probes directly on the ESP-pins of the nodeMCU or WeMos module.

Please be aware that a digital voltmeter is slow. The result you see on the display is always an average value. If you really need to know what's going on with your power supply an oscilloscope is necessary as it can cope with short voltage peaks or drops.