PIC16F876A based LCD Temperature measurement project
was planned to measure two Temperatures Simultaneously. It can be
effectively used to measure your room temperature and may be for measuring RF Amplifier Temp.
this project for a friend who wanted to measure inside & outside
temp in a Vegetable cold storage. It has been working very accurately and
reliably for couple of years.
In addition to LCD display, TH1 also produces
DATA Logger output available at D9F connector which may be used for
recoding temperature data.
The Hardware is quite simple using a PIC16F876A
& its two 10bit A/D measuring inputs. Temperature sensors are tiny
3 terminal TMP36 from Analog
Devices. However, any other sensors with similar data may be
Accurate reference is created by using MCP1525
which is a 2.5V reference. Sensor volatges are also prduced by using
similar type of Microchip Sensor MCP1541 which is a 4.096V reference.
Data-Logger output is routed thru MAX232 type of
RS232 level shifter to D9F connector. A serial cable is required to
connect to PC's COM port.
Click to enlarge
Two sensors may be used. Sensors are in TO92
package and an extension board is provided with Kits with a 1M RJ45
cable. Sensors are connected to extension board by way of screw
A simple two core shielded cable (2 wires in
center and a shielding braid) may be used. However any three core
cable without shield may also work well.