I don't particularly like using the Max232 because it raises the voltage levels to about +10 / -10 volts.īelow are 2 links to Items on Ebay that should work. These will all required some external components to invert the data, either a couple of transistors, or an Inverter IC such as a 74HC14, or a Max232 type chip. Most other USB/TTL adapters will use a PL2303, CCP2102, or CH340 chipset. This eliminates the need for external components to invert the data.

These can be programmed via a utility supplied by FTDI to invert the data as required by the Picaxe. I use a 250 ma inline fuse but a polyfuse is another option.Īs has been advised, a Cable/ adapter.or breakout board with an FTDI chipset is the most flexible. But I would certainly recommend a fuse of some kind. USB ports are generally very well protected. I have never had a problem with a USB port. I have been powering Picaxe chips and breadboards via USB cables / adapters for nearly 10 years now. This happens when you are powering from batteries-shouldn't be a problem if powering from the usb dongle. The biggest disadvantage I have found is that they idle high, and can 'phantom power' the picaxe when you think you have switched it off.

I use cheap usb serial dongles with pl-2303, ch341, or cp210x controllers like these: The openwrt devices provide network connectivity, either wired or wireless. The picaxe reads temperatures, opens heating zone valves, operates servos to turn on electric heaters in my barn, etc. I power and communicate with a dozen or so picaxe chips using usb serial from small routers or devices running openWrt Linux or debian, such as gl.inet, tp-link wr703n, HLK-RM04, DX WR3G01, Hame A5, et.

Openwrt usb serial ftdi