Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Another great temperature controller with LCD

room temperature controller with LCD

In order to maintain comfort in the room you need temperature controller. The best results are achieved with heater and cooler working together. Sameer have put quite simple room temperature controller using AT89S52 microcontroller. These microcontrollers are based on industry-standard 80C51 instruction set. Controller reads temperature from same reliable Ds1820 temperature sensor. While microcontroller doesn’t have internal EEPROM there is an external AT24C02 IC used to store preset values. It is interfaced using I2C communication protocol. Also there is a standard alphanumeric LCD driven in 4-bit mode where temperature and status messages are displayed. Temperature threshold values can be changed using couple push buttons. Unit has two relay switches where one controls heater and another cooler. Depending on current temperature value the relays can be switched differently. For instance is… Continue reading

Temperature controller with IR connectivity

This temperature may look like several dozens thermostats that measure temperature and performs some action (switches relay) when temperature threshold is reached. Actually this is what this one does – it activates a relay with fan connected when temperature reaches 40ºC. There is another thing what makes this device little bit different from others – it accepts TV remote control commands. By pressing 1, 2, 3 and 4 buttons each of four relays can be turned ON/OFF manually. Design is based on AT89C51 microcontroller which reads LM35 temperature sensor data via ADC0804 ADC. Compares temperature value to given threshold and in case of alarm it sends relay activation signal via ULN2003 Darlington transistor array chip. Grab project files, build and keep things cool. Continue reading