Testing for the existence of a sensor

I'm trying to use an ee892 CO2 sensor in a project I'm working on. It uses a proprietary low speed derivative of I2C but it's not compatible with the I2C bus. Can you give me some ideas on how I could test to see if this thing is alive?

How do I strobe a pin to send a bunch of data then wait for a certain period for a reply before moving on? It's the waiting for the reply part that I'm having problems with.

then wait for a certain period for a reply

Hard to believe that you've never heard of delay().

The "See also" section is interesting, too.

daemach: Can you give me some ideas on how I could test to see if this thing is alive?

Can you give a link to the datasheet?

Look into shiftOut() and SoftwareSerial. to communicate with a serial device, you need Clock, Enable and Data. So you need : What clock frequency or baud rate, enable ( 0 or 1 ) and the type of data format ( 1 start bit, 8 data bits, 1 stop bit , 1 parity bit ) ← example. If those instructions it is not working, you have to “homemade” a function to generated the proper clock/data.

my 2 cents.