Procedure - Guidance System Electronics[edit | edit source]

The guidance system consists of a wire generating circuit and a sensor circuit. It can be connected to an ADC (ADS1115) and a Raspberry Pi to control two ODrive motors.
Wire Guidance Materials
Description Count
Generator PCB 1
Sensor PCB 1
ADS1115 ADC 1
3.3 kΩ Resistor 1
12 kΩ Resistor 1
47 Ω Resistor 1
10 kΩ Resistor 4
1 MΩ Resistor 4
4.7 kΩ Potentiometer 1
12 kΩ Resistor 1
100 nF Capacitor 2
1.2 nF Capacitor 1
1 uF Capacitor 1
22 nF Capacitor 2
1 mH Inductor 2
LM324N Amplifier 1
NE555 Timer 1
2.1x5.5mm barrel connector 1
2 positions terminal connector 3
3 positions right angle pin header 2
~1 meter 20AWG cable (for the inductors) 1
~100' 22 gauge multi-strand wire (for the following wire) 1
Tools
Soldering Iron

(Photos will be added when Growbot is accessible)

  1. Fontaine Lebon à Bourges.jpg
    Solder all components onto each of the PCBs.
  2. Fontaine Lebon à Bourges.jpg
    Wire the Sensor PCB, Generator PCB, ADC and Raspberry Pi.
  3. Fontaine Lebon à Bourges.jpg
    Run autoTest.py on the Raspberry Pi with 0 as command.
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    Record MAX value (inductor closest to following wire) and MIN inductor (far away from following wire).
  5. Fontaine Lebon à Bourges.jpg
    Insert MAX and MIN values into autoTest.py.
  6. Fontaine Lebon à Bourges.jpg
    Ready to test with motors. See < > to install motors.

Procedure - Guidance System Antennas[edit | edit source]

The guidance system antennas are 3D printed and can be assembled with 3D printed pins or screws and bolts. It consists of 2 sets of three parts. The STL files can be accessed on the OSF page. <add link to OSF>
Wire Guidance Materials
Description Count
3M Screws 6
3M bolts 4
3M Bolt Slots (fits in aluminum extrusion) 2
Tools
Super glue
Small zip ties

(Photos will be added when Growbot is accessible)

  1. Fontaine Lebon à Bourges.jpg
    Mount both BotEnds onto aluminum extrusion with an M3 screw.
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    Connect both WireHolders in each BotEnd with an M3 screw and bolt.
  3. Fontaine Lebon à Bourges.jpg
    Connect both SensorEnds in each WireHolder with an M3 screw and bolt.
  4. Fontaine Lebon à Bourges.jpg
    Place inductor wires in WireHolder slots and secure with a ziptie.
  5. Fontaine Lebon à Bourges.jpg
    Apply a dab of super glue to SensorEnd and set inductor in the circular slot.
  6. Fontaine Lebon à Bourges.jpg
    Adjust the width between sensors for your liking.
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Authors Erica Umlor, Wilson Holmes
Published 2020
License CC-BY-SA-4.0
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