Edit Talk

OSHE Growbot Guidance System

From Appropedia

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.
  4. Fontaine Lebon à Bourges.jpg
    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.
  2. Fontaine Lebon à Bourges.jpg
    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.
Growbot
Overview
Growbot Printed Parts Glossary
Growbot Bill of Materials
Growbot Tools Needed
Preparatory Materials
Metal Prep
Wire Harness Prep
Assembly
Frame
Motor
Axle
Drivetrain
Sensors
Guidance System
Electrical
Final Mechanical Assembly
Wiring
Firmware Installation
Follow-up information
Growbot SOP
Maintenance