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Detecting Small Capacitive Sensors Using the MCP6291 and PIC16F690 Devices

From Microchip Technology, Inc.
 

 
This application note shows how to use a PICmicro® microcontroller and minimal external circuitry to detect small capacitances. The design is based on an operational amplifier (op amp) integrator. A capacitive humidity sensor is used to illustrate this type of application. The design is measured to verify the theory and design choices. Alternatives and modifications to this design are briefly discussed. The measurements for this application note were made on the Humidity Sensor PICtail. Demo Board, which is discussed in the user.s guide (DS51594) [15].
Product Announcements
Sensortechnics, Inc. - Capacitive Level Sensor
Sensortechnics' CLC series uses a new contact-free capacitive sensor technology to continuously measure the fill level of liquids as well as granular or pulverized materials. (read more)
Rotronic Instrument Corp. - Capacitive Humidity Sensor for OEM Applications
Based on a unique technology, the CS 30 capacitive humidity sensor is designed specifically for high volume OEM applications where both high quality and low cost are important requirements. (read more)
Microchip Technology, Inc. - Embedded Wi-Fi in PIC® Microcontroller With ZeroG
Explorer 16 Development Kit and PICtail™ Daughter Board Available Now from microchipDIRECT; Enable Wi-Fi Wireless Networks Using 8-, 16- or 32-bit PIC MCUs... (read more)
Sensirion AG - Digital Humidity Sensor SHT1x (RH&T)
The digital humidity and temperature sensor SHT1x is the reflow solderable version of Sensirion's family of relative humidity sensors. The capacitive humidity sensor provides digital and fully... (read more)
Sensirion AG - Digital Humidity Sensor SHT7x (RH&T)
The digital humidity and temperature sensor SHT7x is the pin-type version of Sensirion's familiy of relative humidity sensors. The capacitive humidity sensor provides digital and fully calibrated... (read more)
Higgstec Inc. - Taiwan Low-cost:Projected Capacitive Touch Panel
Projected Capacitive Touch Panel works outdoors in rain, snow, ice and dust. It has high resolution, great transmittance, excellent linearity and outstanding accuracy... (read more)
Rotronic Instrument Corp. - ROTRONIC - HYGROMER HH1
The new HygroMer HH-1 humidity sensors from ROTRONIC is corrosion-resistant for measurements in environments with hydrogen peroxide, sterilisers, autoclaves, etc. • Response time <10 s... (read more)
Advanced Input Systems - Capacitive Switch
Capacitive sensors allow people to touch something and see a reaction. The electrical current that passes from the finger into the machine makes something happen. When you are using your hands you... (read more)
Pressure Profile Systems, Inc. - DigiTacts, Digital Output Tactile Sensors
PPS' most versatile digital output technology line allows for embedding into most any application. (read more)
 
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