In this chapter, we will use the Raspberry Pi to create a simple robotic arm actuated with several micro servos mounted on a movable base using two motors. All of these will be controlled through a web interface via the Pi GPIO port.
We will also mount the camera module at the front of the base and stream it to the web interface, enabling a full remote operation.
This is a list of the parts that you will need to complete this project. Most of them will be available at either a local electronic components store or an online retailer:
- The Raspberry Pi
- A 3 mm MDF (600 x 600 mm)
- M3 and M4 screws, washers, and nuts
- The M3 threaded bar
- 4x micro servos (www.amazon.co.uk/Vktech-MG90S-Geared-Helicopter-Airplane/dp/B00FF26480)
- Servo extension cables (www.amazon.co.uk/300mm-Servo-Extension-Cable-Futaba/dp/B009REWWGU)
- A relay board (www.ebay.co.uk/itm/New-8-Channel-5V-Relay-Module-Board-for-Arduino-PIC-AVR-MCU-DSP-ARM-UK-/151105724470)
- Geared motors (www.rapidonline.com/Electrical-Power/950d5001-Gearbox-and-Motor-500-1-6mm-Shaft-6-15v-37-1114)
- 0.1 inch pin headers
- 0.1 inch female-to-female pin jumper wires
- 0.1 inch male-to-female pin jumper wires
- A 18 AWG wire
- Thick copper wire (www.clasohlson.com/uk/Copper-Wire-1.2-mm/30-5028)
- A small section of a prototyping board (www.maplin.co.uk/p/veroboard-copper-stripboard-100x160mm-a62rl)
- A 9 V battery
- A 9 V battery clip (www.maplin.co.uk/p/pp3-snap-battery-clip-hf28f)
- A USB power bank (www.maplin.co.uk/p/lithium-ion-6000mah-portable-power-bank-n48lk)
- The 38 mm version of a castor (www.clasohlson.com/uk/Swivel-Castors/Pr309743000)
- An old USB cable
- The Raspberry Pi camera module
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