The 1129 is a capacitive touch sensor and can detect a touch through plastic, glass, or paper. We recommend a material thickness of up to 1/2”.
The sensor can work as a close proximity sensor, sensing objects at a distance of up to 1/2” from the board in all directions without direct contact.
On the bottom side of the Touch Sensor there is a small exposed metallic pad. A soldered connection can be made to the pad to increase the size and dimensions of the touchable area, such as attaching the sensor to a metallic object or some wire.
This particular revision of the 1129 recalibrates after 60 seconds of contact (as opposed to 45 seconds on the previous revision). Other than that, this sensor will function the same as the 1129_1.
|Sensitivity (Thickness of Material)||1/8"||1/2"||1/2"|
|Sensor value when Touching||0 (0V)||1000 (5V)||1000 (5V)|
|Sensor Type||Touch (Capacitive)|
|Controlled By||VoltageRatio Input|
|Sensor Output Type||Ratiometric|
|Detecting Distance Max||12.7 mm|
|Current Consumption Max||110 μA|
|Output Impedance||1 kΩ|
|Supply Voltage Min||2 V DC|
|Supply Voltage Max||5.3 V DC|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||85 °C|
|Date||Board Revision||Device Version||Comment|
|November 2009||0||N/A||Product Release|
|September 2012||1||N/A||Redesign due to component obsolescence|
Welcome to the 1129 user guide! In order to get started, make sure you have the following hardware on hand:
Next, you will need to connect the pieces:
Now that you have everything together, let's start using the 1129!
In order to demonstrate the functionality of the 1129, we will connect it to the 1018, and then run an example using the Phidget Control Panel on a Windows machine.
The Phidget Control Panel is available for use on both macOS and Windows machines. If you would like to follow along, first take a look at the getting started guide for your operating system:
Linux users can follow the getting started with Linux guide and continue reading here for more information about the 1129.
After plugging in the 1129 into the 1018, and the 1018 into your computer, open the Phidget Control Panel. You will see something like this:
The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:
The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.
Double-click on a Voltage Ratio Input object in order to run the example:
General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:
The 1129 is actually a capacitive change sensor. When the capacitance changes the Sensor Value reports 1. If the Sensor Value remains at 1 for longer than 60 seconds, it will recalibrate back down to 0, regardless if the sensor is still being touched. This recalibration can also be done manually by unplugging and plugging the sensor back into the 1018 (or compatible product). This is a useful feature because it means that the sensor can be mounted on a flat surface such as a piece of glass or plastic and be reset so that it does not register the change in capacitance caused by the surface it is mounted on. On the bottom side of the 1129 there is a small exposed metallic pad. A soldered connection can be made to the pad to increase the size and dimensions of the touchable area, such as attaching the sensor to a metallic object or some wire. Once the sensor is recalibrated, the Sensor Value will increase to 1 if the attached object is touched anywhere. Although there is an exposed metallic pad on the bottom of the board, the pad does not have to be touched directly to activate the sensor - touching anywhere on the board will activate the sensor. The 1129 can work as a close proximity sensor, sensing objects at a distance of up to 1/2" from the board in all directions without direct contact. The 1129 will also work through a thickness of up to 1/2" of glass, plastic, or paper.
The capacitor labelled C1 is the sensing capacitor. In other words this is the capacitor that determines how sensitive the sensor is. By default it is a 10nF capacitor. By changing this value we can adjust the sensitivity. Smaller capacitors will yield lower sensitivity while higher values will yield higher sensitivity. The integrated circuit (IC) on the 1129 specifies that the acceptable range for C1 is 2nF-50nF. In testing, 2nF will not sense through any thickness of material while 50nF can sense through over 1" of material and even through double paned windows with an air gap of up to 3/4". If the size of your capacitive touch surface is very large, you may have to increase C1 even more. Up to 100nF even. (C1 is soldered onto the board, in order to replace it you will need a soldering iron).
The Phidget Cable is a 3-pin, 0.100 inch pitch locking connector. Pictured here is a plug with the connections labelled. The connectors are commonly available - refer to the Analog Input Primer for manufacturer part numbers.