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 .

NOTE: WE ARE CURRENTLY WORKING ON THIS PAGE - PLEASE LOOK AT PCB 1.2 FOR MISSING INFORMATION

Specifications

PCB size: 272mm x 115mm

Schematics, Drawings, Photos

Videos

Building manual (German)

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

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.

Component	Can be blocked by	Can block	Profile	Comment

JP3	P22, P4		low	SMD
F1	JP1?, C1?		low	SMD
S1			low	solder a small lead as bridge
S2			low	solder a small lead as bridge
S3			low	solder a small lead as bridge

C2			low (lying)
C3			low (lying)
C9			low	Wasn‘t included. Maybe optional?
C12			low (lying)
D10	K3		low

I2C1			low	connector socket
I2C2			low	connector socket
I2C3			low	connector socket
I2C4			low	connector socket
I2C5			low	connector socket
I2C6			low	connector socket
I2C7			low	connector socket

P1	C11?		low	connector socket
P2	C11?		low	connector socket
P3			low	connector socket
P4		JP3	low	connector socket
P5			low	connector socket
P6			low	connector socket
P8	SP1	SP1?	low	connector socket
P9			low	connector socket
P11			low	connector socket
P12			low	connector socket
P13			low	connector socket
P14			low	connector socket
P19	C11?		low	connector socket
P20	C10?		low	connector socket
P21	C11?		low	connector socket
P22		JP3	low	connector socket
P23			low	connector socket
P25			low	connector socket
P26			low	connector socket
P27			low	connector socket
P28			low	connector socket
P30			low	connector socket
P31	C10?		low	connector socket
P35			low	connector socket
P40			low	connector socket
P41	C11?		low	connector socket
P44			low	connector socket
P46	SP1, C11?	SP1?	low	connector socket
P48			low	connector socket

P7			low	socket
P10			low	socket
U1			low	socket
U2			low	socket
U3	C10?		low	socket
U8RTC			low	socket?
U11			low	socket

JC2			mid	pins
JC3			mid	pins
JC4			mid	pins
JC5			mid	pins
JC6			mid	pins
JC7			mid	pins

JP1		F1?	mid	pins
JP2			mid	pins
JP4			mid	pins
JP5			mid	pins
JP6			mid	pins
JP7			mid	pins
JP8			mid	pins
JP9			mid	pins
JP10			mid	pins
JP11			mid	pins
JP12			mid	pins
JP13			mid	pins

P24			mid	pins
P29			mid	pins
P32			mid	pins
P33			mid	pins
P34			mid	pins
P38			mid	pins
P45			mid	pins
P47			mid	pins
P50			mid	pins
P51			mid	pins

BY1	PRFA2?	RL1?	low
BY4	PRFA2?		low
BY7	CC2?		low
DKE1	CC2, RL2?		low
BY8	CC2, RL2?		low
BY9	PRFA1?, C10?		low
BY10	PRFA1?, CC3, RL3?	CC3?	low	place in a raised position

RL3	C10, BY2, BY11, PRFA1?	BY2?, BY10?, BY12?	low

PRFA2	RL1, C11?	BY1?, BY3?, BY4?	low (lying)	lay down later
RL1	BY3, DKE2, BY1?, C11?	PRFA2	low
BY3	PRFA2?	RL1	low

PRFA1	RL2	RL2?, RL3?, BY9?, BY10?, BY12?, C10?, EF3?	low (lying)	lay down later
RL2	P49, BY6, BY5, PRFA1?	BY8?, DKE1?, PRFA1	low

EF3	PRFA1?, CC3	CC3	low	Conflict CC3
CC3	EF3, BY12, BY10?	EF3, BY10	high	Conflict EF3

BY2	C11?, RL3?	RL3	low
BY5	CC2?	RL2	low
BY6	P49	RL2	low
BY12	RL3?, PRFA1?	CC3	low
BY11	C11?	RL3	low
DKE2	C11?	RL1	low

Dual1	C10	C10?	low	socket; solder the sockets near the screw connectors later
Dual2	C11	C11?	low	socket; solder the sockets near the screw connectors later
K3		D10	mid	relais socket
Due	C10?		high	high pins; insert them into the Due-board first and then place them alltogether into the mainboard for soldering
SP1	P8?, P46?	P8, P46	mid	Speaker; alternatively placed at SP2
SP2			mid	Speaker; alternatively placed at SP1
C10	PRFA1?, Dual1?	Dual1, Due?, P31?, RL3, U3?, BY9?	high (lying)	Hot glue the capacitor to the mainboard for mechanical stability
C11	Dual2?	DKE2?, Dual2, P1?, P2?, P19?, P21?, P41?, P46?, PRFA2?, RL1?, BY2?, BY11?	high (lying)	Hot glue the capacitor to the mainboard for mechanical stability

P15/P16/P18			high	screwed connector socket
P17/P39/P36			high	screwed connector socket
P37			high	screwed connector socket
P42			high	screwed connector socket
P43			high	screwed connector socket
P49	EF1?	RL2, BY6	high	screwed connector socket

C1		F1?	high (upright)
C8			high (upright)
C13			high (upright)
CC1			high
CC2		DKE1, BY5?, BY7?, BY8?	high
D1			high
D9			high
D73			high
Q2			high
Q4			high
EF1		P49?	very high
EF2			very high

Front view of an equipped mainboard v1.3

Back view of an 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:

remove arduino and all plug-in modules
remove the DC/DC jumper (JP1, pwr 9v)
add a switch (or jumper) to P20 (button) and make it permanently switched on
connect battery - LED +24v should be ON
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)
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.