I am involved in the work to develop a circuit board for prototyping the ESP32-C6 WiFi chip. The board can be mounted directly on a breadboard and has DHT11, LM35 sensors and also a WS2812 RGB LED.

NOTE: Official product page coming soon.

In previous updates (here and here) I showed some of the decision-making regarding the board’s characteristics, as well as a preliminary view of the unit cost. Since then, I finalized the design, had the printed circuit board produced (at PCBWAY, which sponsored me) and purchased most of the components.

The final schematic is seen below, made in Kicad and available here. Note that the three available peripherals (LM35, DHT11 and WS2812) have jumpers to disconnect them from the circuit when not in use.

The printed circuit board is seen below. I had it manufactured in standard thickness (1.6mm) and in black with white silkscreen.

The current state of the cost

As previously mentioned, the cost of each component and total board is:

• ESP32-C6 Xiao SeeedStudio US$5.20 – R$27.92
• Printed circuit board R$0 (I was sponsored by PCBWAY)
• Silicon Life DHT11 R$14.90
• LM35 from Silicon Life R$14.90
• 3x SMD Resistor 470R 0805 R$0.06 each (total R$0.18)
• 1x 10k 0805 SMD Resistor R$0.06
• LM1117, WS2812 LED, 3x jumpers, 1/2 2.54 pin bar, 2x 10uF electrolytic capacitors, 4x 100nF ceramic capacitors R$8.81
  

We got at a total cost of R$66.77 (US$13), not counting the cost of the PCI. For equipment that you can assemble at home, the cost is not that high. Even more so when it comes to Espressif’s newest WiFi chip, the ESP32-C6.

Next steps

I had the PCB manufactured in China, so it will take more than 30 days for the material to reach my hands. Stay tuned for the next steps.