Sonoff Basic Programming Clip

thingiverse

As DrZzs calls this, the Jumper Holder Thingy. The new Sonoff Basics and possibly other models are being shipped with solder filling their serial programming interface. To flash these devices, you'll need to remove the solder or develop some dexterity to hold your 4 wires (Vcc, Gnd, RX, TX) in place, press the button, plug in a USB UART TTL adapter set to 3.3 volts only, release the button, and then flash the device. While doable, this process can be challenging. That's where this clip comes into play. By printing it and installing pogo pins, you can connect it directly to your USB UART TTL adapter, holding the pins securely in place over the correct connectors. The P75-E2 Convex Tip Metal Spring Test Probe Pins I'm using measure 1.5 mm in diameter. You can find them here: https://www.amazon.com/gp/product/B018YPQ6ZK/. Update: After some time, I noticed that the pressure on the pogo pins to the board was decreasing, requiring me to add a rubber band or squeeze the pins slightly while programming. To address this issue, I've created V5 by adding a 3/8" x 2" (10mm x 50mm) Barrel spring. This modification seems to work nicely. I'll also leave V4 available for reference. Note: To print this model correctly, rotate it so that it sits flat in your slicer.