With an Arduino, some DS18B20 temperature sensors and a Si8600 …
↓↓↓ Complete description, time index and links below ↓↓↓

We’ve already galvanically isolated an SPI bus (link below). With all SPI bus lines being unidirectional and chips for the job readily available that was kinda easy. The 1-Wire bus however uses only, well, one line. And that is bidirectional.

It seems there are no chips available for the digital isolation of 1-Wire buses. But there’s another bus using a bidirectional line: I2C. And digital isolators for the I2C bus are available. Maybe those will work for 1-Wire buses too.

00:00 Intro – why would you want to galvanically isolate a 1-Wire bus?
03:17 Searching – for a digital isolator that can handle 1-Wire
06:31 Si8600 – does the job
08:26 Isolating 1-Wire – with the Si8600 on the breadboard
11:38 Isolating DC – with an unregulated, isolated DC-DC converter
13:10 Schematic – nothing much to it
14:49 Code – just a quick look
16:29 Bonus 1 – how bidirectional digital isolators prevent latching
22:48 Bonus 2 – input/output filtering for the DC-DC converter (unnecessary)
29:58 Wrap-up – better safe than sorry

Tutorials [ Ссылка ]
Arduino, DS18B20/DS18S20 Temperature Sensor and 1-Wire Bus – The Details [ Ссылка ]
Galvanic Isolation of SPI Devices (e.g. Arduino, MAX6675 and SI8631) [ Ссылка ]
Isolated, Unregulated DC-DC Converters – The Pitfalls [ Ссылка ]
Arduino Nano Every: The Better Nano? – Tests and Shootout with Nano v3 [ Ссылка ]

#robertssmorgasbord #tutorials #tutorial #how-to #bus #isolation #galvanic

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