Measure humidity and temperature on one TTL line


Posted on Jun 6, 2012

By combining the responses of an Analog Devices (www.analog.com) AD590 temperature sensor and a Humirel (www.humirel.com) HS1101 humidity sensor, you can generate a single TTL-level signal containing information from both sensors (Figure 1). This design uses a 74HC123 monostable multivibrator, IC1, to form a free-running oscillator. The AD590 current source (1 µA/K), IC2, and a fixed 1-nF capacitor, C1, control the timing of the first monostable multivibrator in the 74HC123.






Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Field Strength Meter
Privacy in parallel telephone line
Low-Frequency Crystal Oscillator Circuit
build solar engine
60W inverter using transistors
RC PIC
USB Joystick
2Digit up/down Counter
High Quality Intercom
Refrigerator power protection circuit
Days to TN-1 Intelligent negative pulse charging circuit



Top