I use this setup to monitor a server room, and as a weatherstation.
This project consists of:
- A Dallas 1-Wire bus network
- Interface between RS-232 and the Dallas 1-Wire system
- Digital temperature sensors connected to the Dallas 1-Wire bus (DS1820/DS18s20)
- Software setup to gather and graph temperatures
Step 1: You need
- Some linux skills
- Basic electronics skills, soldering etc..
- 1 6.2V Zener diode (1N5234)
- 1 3.9V Zener diode (1N5228)
- 2 Schottky diodes (1N5818)
- 1 1.5 k resistor
- 1 2pin screw terminal
- 1 D-sub 9 female connector with solder points
- 1 small piece of perfboard.
- One or more Dallas Semiconductor DS1820 or DS18s20 digital temperature sensor
- Cat5 cabling
- Shrink tube
Step 2: Build the RS232 interface
Figure out how small you can make it.
Put all the components on a perfbaord. Place them with the circuit in mind. We don't want to add any wires to the bottom of the circuit! Se image.
Cut out the right size perfboard.
Just drag a sharp knife a few times over the row of holes where you want to cut.
Do this on both sides, then just break it in two. It usually breaks at the fault line you created.
Solder the components in place. and connect the solder points to complete the circuit.