Sometimes (as with re-programming an ESP82xx device) we may want/need to make temporary electrical connections without soldering & desoldering. Some things like earlier Itead ESP82xx devices provide a header of 4 programming holes, but other devices (like a more recent Itead S26 ECOPlug) may not provide such convenience. What can we do then?
To connect to desired locations, I have used dupont cables, hair clips, alligator clips, grabber clips, test clips. I use cellophane or electrical tape to insulate pads I don't want connected.
In this post, see my home made programming jig that used waste plastic, alligator clips, & "whiskers" from resistor leads.
<< Paired, color-coded Alligator clips connected by a wire, one source here.
Make Connections without Solder, More Examples of Devices Used
<< hair clips, one source here The hair clips I want are flat where the two prongs come together & have no inner "teeth." Sometimes I bend in the point of the shortest prong so it can clamp onto a small pad.
<< test clips with hook, one source here. These have a small hook that extends when the plunger is pushed.
<< grabber test hook clip, one source here. These have a tiny "pincher" that extends when the plunger is pushed.
In another thread, I'll document how I used some of the above devices to re-program an Itead S26 ESP8266 ECOPlug