Wireless monitoring system using raspberry pi

how many sensors are you planning on installing and how far away will they be

I plan to intsall around 8 sensors. All sensors will be at a distance of around 5-10 metres from each other.

I was thinking of using an arduino, as it has a lot analog pins and digital pins, and transmit the data from multiple sensors from arduino serially to the pi.

But for wireless transmission, I am not sure which protocol or module to use.

Bhuvan

You may be confusing protocol (software) and Module (hardware) slightly.

A protocol is an pattern of numbers that when broken up represent the information you want..

It can be as simple as SiteID (0-8), Water level (0-255), Temperature (0-999)  but they are always the same length. ie 7 numbers

When you receive the number string, the first is the site, (and should be in the range 0 to 8), the next three will be the Water Level (and should be between 000 and 255), and the last three are the temperature (and should be 000 to 999).

At the sensor end, if you add 30.0 to the actual temperature and multiply by 10 before sending, then you have converted the temperature range of -30.0 to +69.9 (assuming you use celcius) into 000 to 999.

At the receive end, when you get the last three numbers you divide by 10 and subtract 30 which gives you the original temperature.

It's also possible to add another number as a checksum, or the other way is send the string twice.

You may also wish to look at the Nordic range of 2.4Ghz Rx/Tx modules that can be had for as low as US$2-3 and they offer a higher power with external antenna.

There are libraries around to save most of the hard work.

Mark

Bhuvan

You may be confusing protocol (software) and Module (hardware) slightly.

A protocol is an pattern of numbers that when broken up represent the information you want..

It can be as simple as SiteID (0-8), Water level (0-255), Temperature (0-999)  but they are always the same length. ie 7 numbers

When you receive the number string, the first is the site, (and should be in the range 0 to 8), the next three will be the Water Level (and should be between 000 and 255), and the last three are the temperature (and should be 000 to 999).

At the sensor end, if you add 30.0 to the actual temperature and multiply by 10 before sending, then you have converted the temperature range of -30.0 to +69.9 (assuming you use celcius) into 000 to 999.

At the receive end, when you get the last three numbers you divide by 10 and subtract 30 which gives you the original temperature.

It's also possible to add another number as a checksum, or the other way is send the string twice.

You may also wish to look at the Nordic range of 2.4Ghz Rx/Tx modules that can be had for as low as US$2-3 and they offer a higher power with external antenna.

There are libraries around to save most of the hard work.

Mark