DS18B20 with eLua + Mizar32

[Gabriel Duarte]

Hello,

I recently bought a DS18B20 temperature sensor, but I got no idea how to connect it to Mizar32 and grab data from eLua. This is the datasheet:

http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf

Which interface I have to use, UART, some PWM pin??

Any help is appreciated ;)

Cheers

--

Gabriel Duarte

Linux User #471185
Rio de Janeiro / RJ
http://genericdev.wordpress.com/

[Bogdan Marinescu]

Hi,

On Tue, May 21, 2013 at 8:52 PM, Gabriel Duarte <confu...@gmail.com> wrote:

Hello,

I recently bought a DS18B20 temperature sensor, but I got no idea how to connect it to Mizar32 and grab data from eLua. This is the datasheet:

http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf

Which interface I have to use, UART, some PWM pin??

Any help is appreciated ;)

Neither, you'd have to use 1-Wire (https://en.wikipedia.org/wiki/1-Wire). We don't have support in eLua  for that yet, although it should be relatively easy to implement.

Best,
Bogdan

Cheers

--

Gabriel Duarte

Linux User #471185
Rio de Janeiro / RJ
http://genericdev.wordpress.com/

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[Gabriel Duarte]

Hi!

The question is just how to send and get data, , what interface I have to use to send and receive data from the sensor. The rest, like decoding data, CRC, I'll implement myself.

Cheers

2013/5/21 Bogdan Marinescu <bogdan.m...@gmail.com>

[Bogdan Marinescu]

Hi,

On Tue, May 21, 2013 at 9:05 PM, Gabriel Duarte <confu...@gmail.com> wrote:

Hi!

The question is just how to send and get data, , what interface I have to use to send and receive data from the sensor. The rest, like decoding data, CRC, I'll implement myself.

And that is exactly what I was telling you. The interface is called 1-Wire, check the wikipedia link from my previous e-mail. Some MCUs have 1-Wire implemented in hardware, but only very few of them, so your best shot is to emulate it with a GPIO pin. I did this once and from what I remember it was quite an easy job.

Best,
Bogdan
 

[Gabriel Duarte]

Ok!

I thought that 1-Wire were only the protocol. Should I use UART from GPIO in Miza32 to emulate? I have seen some Arduino examples and they use PWM ports to read data, do not know if it's the same in eLua.