Support for DS2450 1-wire device

[ulli]

As there is already support for DS18B20 temperature sensor, is it possible to also support the DS2450 4-channel AD-converter/output? This device is perfectly well suited to control light effects in my electric railroad.

[cicciocb]

Where do you buy these devices?

[ulli]

Sorry for the noise.
I believed they are a 1 EUR device, but they are f...ing expensive.
So no other way than finding a different solution.
Is it eventually possible to offer some native 1-wire support? in that case I'd reconsider my old idea of making my own 4- or 5-way output expander using a 12F629 PIC. Basically I want a tiny output device with as little cabling as possible (thus 1-wire).

[ulli]

Some googling convinced me to fall back to good old I2C (PCF8574)

[lyizb]

How would a PCF8574 or PCF8575 substitute for a "4-channel AD-converter"?

Regarding digital expansion, what are you expanding from? If an ESP8266, then the ESP32 S2Mini https://www.aliexpress.us/item/3256805971378303.html provides a considerable expansion for $2.05 while being able to be used with D1Mini PCBs.

[cicciocb]

For the I2C there are a lot of possibilities, for both DAC and ADC.

[ulli]

Hi cicciocb and lyizb,

thanks for your hints. i don't need an A/D converter at all. I wanted to "misuse" them as digital outputs,
Using 1-wire makes cabling a bit easier.

I now ordered a few PCF8574 boards from China, falling back to I2C.

[cicciocb]

For one wire you could use ws2812 hacked

[ulli]

I don't really understand.
It uses 1 wire for data transmission, which is fine.
It uses a simple protocol supported by Annex, which is fine, too.
BUT how do I get at the output lines? LEDs and controller are integrated, no way to contact something.
Or do you have a solution that I don't see?

[waldli]

Hello Ulli, you get the ws2811 as a single IC
where you can connect the individual diodes yourself.

Waldemar