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Step 3Testing the RS232 interface
1)
Download and install digitemp.
On Debian and Ubuntu Linux, this is done by running `sudo apt-get install digitemp`.
2)
Connect a DS1820 to your circuit.
The middle leg goes in the DQ port, the other two legs go in GND
3)
Connect the circuit to a computers rs232 port.
I only cover doing this with Linux, but it is also possible to do this in windows..
4)
If the command `digitemp` doesnt work, it's because there are multiple versions of digitemp.
type digitemp, then press tab to see all of them.. digitemp_DS9097 is the right one for this 1wire busmaster.
Just for the sake of simplicity, we want the command to be `digitemp`, not `digitemp_DS9097`.
type `sudo ln -s /usr/bin/digitemp_DS9097 /usr/bin/digitemp`
5)
As root, or using sudo:
Run `digitemp -s /dev/ttyS0 -i`. This searches the 1wire network for sensors, and creates a config file for digitemp. If you are using COM2, use -s /dev/ttyS1.
Run `digitemp -a` to read the temperature of the connected tempsensor.
See the screenshot
6)
Do this for all the sensors you are going to use, and write down the addresses for each one.
When you have multiple sensors, it's nice to know which is which.
Download and install digitemp.
On Debian and Ubuntu Linux, this is done by running `sudo apt-get install digitemp`.
2)
Connect a DS1820 to your circuit.
The middle leg goes in the DQ port, the other two legs go in GND
3)
Connect the circuit to a computers rs232 port.
I only cover doing this with Linux, but it is also possible to do this in windows..
4)
If the command `digitemp` doesnt work, it's because there are multiple versions of digitemp.
type digitemp, then press tab to see all of them.. digitemp_DS9097 is the right one for this 1wire busmaster.
Just for the sake of simplicity, we want the command to be `digitemp`, not `digitemp_DS9097`.
type `sudo ln -s /usr/bin/digitemp_DS9097 /usr/bin/digitemp`
5)
As root, or using sudo:
Run `digitemp -s /dev/ttyS0 -i`. This searches the 1wire network for sensors, and creates a config file for digitemp. If you are using COM2, use -s /dev/ttyS1.
Run `digitemp -a` to read the temperature of the connected tempsensor.
See the screenshot
6)
Do this for all the sensors you are going to use, and write down the addresses for each one.
When you have multiple sensors, it's nice to know which is which.
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Pin 2 Transmit
Pin 3 Receive
Pin 7 Ground
Pin 20 DTR (if using non-parasitic)
great job
thanks