Since recently we have seen failure rate with nodeMCU below 0.5% (so less than 1 for 200 pcs) we decided to stop testing them. Please order factory sealed nodeMCU modules

NodeMCU v3 pin function change!

Chinese manufacturers did some improvement to nodeMCU v3 design.They replaced the USB / Serial chip with one that does not require an external resonator. Since this chip is “drop-in replacement” PCB did not change, resonator is just not placed in. But… it looks like GND pads of resonator were only path connecting GND plane with pin GND next to Vin pin. So…

If You want to power nodeMCU with external power supply via Vin pin, connect power to Vin and GND to some other GND pin on board, not this next to Vin.

NodeMCU V3

NodeMCU WiFi module based on ESP8266 (ESP-12E module). This board is tested by us. Each board is flashed with WiFi scan to check if it works correctly (firmware flashed dumps list of seen SSIDs in range, so we see that ESP8266 can be programmed and it is working).

Dane techniczne:

• Module with build in ESP-12E with PCB antenna
• WiFi connectivity: 802.11 b/g/n
• Modes: (Access Point), STA (Standalone), AP+STA
• Supports: TKIP, WEP, CRC, CCMP, WPA/WPA2, WPS
• Supply voltage: 3.3V (or 5V via micro USB port)
• CPU: RISC 80MHz (overclockable to 160MHz)
• 10 GPIO - PWM / I2C / SPI / 1-Wire
• Max current on I/O pins: 12mA
• USB-UART converter - CH340
• Build in ADC - 10-bitowy
• 30 pins in 2,54mm raster
• micro USB socket
• Size: 58 x 30mm