Aktuelle Version vom 21. März 2021, 12:53 Uhr

Steps

Assembled mainboard v1.3

This page describes how to assemble PCB 1.3, how to add modules and how to configure the PCB. The PCB and all required modules can be purchased as complete kits via the shop .

Specifications

PCB size: 272mm x 115mm

Question: Where should the on/off switch be placed?

Schematics, Drawings, Photos

• Schematics
• Assembly, Jumpers top
• Assembly, Jumpers bottom
• PCB image
• Photos

Videos

• Build videos collection (English)

• Assembly part 1 (jumper, capacitors (power), INA, jumper power, bargraph, bluetooth, jumper I2C bus)
• Assembly part 2 (motor drivers)
• Assembly part 3 (Arduino, protection, MOSFET, fuse holder, relay)
• Assembly part 4 (back side: odo-divider, power connectors, buzzer, resistors, capacitors)
• Assembly part 5 (sensor jumpers, connector sockets)
• Assembly part 6 (Capacitors motor output stage )
• Assembly part 7 (Placing into operation)

Building manual/Instructions

English PDF download link: https://forum.ardumower.de/threads/can-i-help-with-the-complete-english-instructions.23770/

German PDF download link: https://github.com/Ardumower/ardumower/raw/master/Dokumentation/Megashield%20SVN%20V1.3/Aufbaubeschreibung%201.3.2.pdf

additional hints:

• connecting odometry: https://forum.ardumower.de/threads/odometrie-antriebsmotoren-mit-dem-pcb-1-3-verbinden-gel%C3%B6st.23899/

Shopping list

• Shopping list

PCB components

• Main board components for PCB 1.3

Checklist

• only set jumper JP1 (9V power) after you have manually set and measured the correct voltage (9v) at DC/DC Vout pin
• set jumper JP13 on PCB back side for a Marotronics Arduino Due (i.e. Due clone) for automatic reset - Do NOT set this jumper for an original Arduino Due!
• set jumper JP12 (GPS signal voltage) to 3.3VP for Marotronics GPS module
• set jumper JP7 (GPS operating voltage) to 5VP for Marotronics GPS module
• set jumper JP10 (Bluetooth signal voltage) to 3.3VP for Marotronics Bluetooth module
• set jumper JP4 (Bluetooth operating voltage) to 5V for Marotronics Bluetooth module
• set jumper JP6 (WIFI operating voltage) to 3.3V for Marotronics WIFI module
• set jumper JP11 (WIFI signal voltage) to 3.3V for Marotronics WIFI module
• set jumper JC2 (IMU signal voltage) to 3.3V for Marotronics IMU module
• only set I2C jumpers JC2, JC3, JC4, JC5, JC6, JC7 (at the top) if there is a corresponding I2C module installed
• set jumper JP8 to 'Always-ON' for tests and for Arduino uploads, for regular operation (and automatic undervoltage power-off) to 'Automatic'
• unset jumper JP3 (2nd mower motor MC33926 M1FB), not used
• Solder a bridge on leftmost pins of S1 ODO right and S2 ODO left (PCB back side)
• RTC module must be installed for proper I2C bus operation
• press button P20 to power-on PCB

Assembly

Soldering the mainboard components

Front view of an empty mainboard v1.3

The assembly of the board is tricky as some components have been packed tightly - especially those below the motor drivers.

The following table lists each component to be placed by hand along with other components that might collide. Collisions marked with a '?' are hard (but still possible) to solder if the components are not placed in the right order. Those without a '?' are impossible. The table has been sorted to provide a practical order for soldering: low components come first and components blocking each other are in the right order. Similar components and spatiality has been used to form groups.

Front view of an equipped mainboard v1.3

Back view of an equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Closeup of equipped mainboard v1.3

Soldering the Voltage regulator

Just insert four 1-pins into the corners. It's pretty easy if you insert the module into the main board while soldering.

Voltage regulator front view

Voltage regulator back view

Plug the voltage regulator into the PCB and make sure the orientation is right!

Voltage regulator placed on the PCB 1.3

basically what you do for the first operation is:

1. remove arduino and all plug-in modules
2. remove the DC/DC jumper (JP1, pwr 9v)
3. add a switch (or jumper) to P20 (button) and make it permanently switched on
4. connect battery - LED +24v should be ON
5. using a voltmeter, adjust the DC/DC converter output voltage to 9V DC (or 8V which is better for the 5v voltage regulator to produce less heat)
6. after getting DC/DC module output 9v (DC), remove battery and install all modules, activate jumper JP1 - PCB can be switched on using P20 and is ready for programming now

Voltage regulator calibration using a multimeter

Soldering the RTC

Just insert a 5- and a 7-pin-row into the module. It's pretty easy if you insert the module into the main board while soldering.

RTC front view

RTC back view

Soldering the motor drivers

For each of the both drivers: Insert a row of 18 stacking pins (the longer ones) row into the mainboard. Insert 6 separated stacking pins into the mainboard. Try to put the module onto those pins and solder them.

Motor driver front view

Motor driver back view

Putting everything together

If you stick everything together, you have something that should look roughly like this:

Assembled mainboard v1.3

Closeup of assembled mainboard v1.3

Closeup of assembled mainboard v1.3

Closeup of assembled mainboard v1.3

Closeup of assembled mainboard v1.3

Forum

https://forum.ardumower.de/forums/ardumower-mainboard-1-3-aktuell.21906/