Chair Assembly Instructions V2
For the second I2C address we need to connect the AD0 pin to 3.3V. The Raspberry Pi board has a pull up resistor to make AD0 default low or high.
- only use massive single conductors. Massive single conductor are much easier to process.
- choose specific colours for specific usages. E.g. red for +5V and black for GND.
- pay attention to a proper electrical isolation. You can use electrical tape and plastic shims to provide these.
- never fold the pressure sensors. The sensors are not very resistent against bending and folding. Always fix them to a solid and even surface.
- the distance sensor needs an even and not glossy surface that it looks on.
Preparations to be done before installing the sensors:
- Remove the black backcover of the back rest. If it is possible, try to remove the backcover without cutting the holding pins. If that is not possible, use the tinsnips to cut the black holding pins.
- Remove all staples which fix the black back rest fabric. Use the side cutter.
- Remove all staples which fix the seating fabric. Use the side cutter.
Mark the sensor places on the wooden surface.
- Use the adhesive surface of the sensor to fix the sensor to the wooden surface.
- Locate the wires as shown in the pictures and solder them to the sensors.
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Mount the gyroscope at the chair.
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Fabric the blue parts with a 3D printer and install the devices in the printed box.
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Install the distance sensor like shown in the picture.
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Fix the box and the power bank slot to the chair.
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Fill the holes in the backrest that are above the sensors with silicone. (The locations are depending on the sensor location!)
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The finished product! The backrest was
- I2C is not turned on by default. We can use raspi-config to enable it.
Short list of used tools
- side cutter big / small
- soldering bolt
- tinsnips - for the backcover
- flatbladed screwdriver small
- Philips-tip screwdriver small and big
- cordless drill and drills in different sizes
- cable stripper
- flat pliers
List of used components Conrad:
- Raspberry PI 3 B
- MicroSD
- Micro USB
- Mini USB
- Box
- Digital Temperature-Sensor TSIC306
- Distanzsensor GP2Y0A21YK0F
- Pressure-Sensor Interlink FSR406
- PowerBank
Reichelt:
- Arduino Nano
- Analog multiplexer
- Single conductor 4 different colours 0,75mm²
Amazon:
- Neuftech GY-521 MPU-6050 Module 3 axis Accelerometer Gyroscope for Arduino Raspberry Pi
Small parts:
- Cable ties
- Electrical tape
- Resistors 1K Ohm
- Screws, Spacer, nut, shim, etc.
- Perfboard
- SubD connector
- Single conductor 4 different colours
For fotos and demo look at Facebook or at our homepage CaDS Group at HAW HAmburg