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

Advanced Power Switcher
Receiver If Amplifier
transistors LC circuit
discussing output stage of square wave
LM386 Audio Amplifier Circuit
PCM2706 USB DAC with I2S
Output 85 to 145V adjustable power supply circuit
1500A-7V-phase thyristor power regulator circuit a plating
Reference time signal generation circuit 32.768kHz



Top