30 Jan '15, 6am

Easier UART to 1-Wire Interface

Easier UART to 1-Wire Interface

The 1-Wire protocol is usually found in temperature sensors, but you’ll also find it in chips ranging from load sensors, a battery sensor and LED driver that is oddly yet officially called a ‘gas gauge’, and iButtons. It’s a protocol that has its niche, and there are a few interesting application notes for implementing the 1-wire protocol with a UART. Application notes are best practices, but [rawe] has figured out an even easier way to do this . The standard way of reading 1-Wire sensors with a UART is to plop a pair of transistors and resistors on the Tx and Rx lines of the UART and connect them to the… one… wire on the 1-Wire device. [rawe]’s simplification of this is to get rid of the transistors and just plop a single 1N4148 diode in there. This would of course be useless without the software to communicate with 1-Wire devices, and [rawe] has you covered there, too. T...

Full article: http://hackaday.com/2015/01/29/easier-uart-to-1-wire-inte...

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