Any of these methods should give adequate results. or two NPN transistors or even two 2n7000 FETS. Inversion can be done with either a digital inverter chip such as an 74HC14 or equivalent. None of these can be programmed to invert the data ( required for Picaxe programming) so external inversion will be necessary. All can usually be made to work unless you happen to get a "fake" Prolific based adapter where the Bridge Chip is not a real Prolific Chip. I have used the arduino one before but at 10€ + shipping it is almost as expensive as the Download have done extensive testing of most of the "cheap" USB to TTL adapters, including several different models of CP2102, Prolific, and CH340/341. One of the cheapest is this one from, where else, China: ![]() What are your experiences with these USB adapters? If I google a litle bit I find all kinds of USB to Serial/UART devices ranging from 2.5 USD up to infinity The circuit only draws a few miliamps, far less then 100 mA and runs on 5V so it should be perfectly happy with USB power. One example is a project where I upgrade a old NES controller to send button events over USB to my PC where a application written in C# converts the serial data back to keystrokes. ![]() The Picaxe download cable is very nice but at 12£ it's quite expensive (compared to the low cost of a picaxe) it also, for a good reason, lacks the ability to power the picaxe. ![]() For some projects I need constant Picaxe to PC communication over USB.
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