DIY Arduino Battery Spot Welder PCB Set V4

This is the new V4 PCB Set.

What you get:

• The two PCBs needed to build your own spot welder

This is the pcb only set. No other components included.

How to built it:

• Assembly instructions for the pcb coming soon
• All pcb files, part list, Arduino code… can be found at my Github page.

Improvements in V4:

• Buzzer: With the buzzer alarms will not only be displayed on the screen but also be audible for the user. This makes it much easier to notice an alarm while working with the welder.
• Temperature Sensor: The temperature sensor will trigger an alarm and disable welding when temperature reaches 65°C to protect the welder from overheating.
• additional 470µF Capacitor: With now two 470µF capacitors it is possible to use weld times up to 100 – 150ms without the risk of the Arduino Nano rebooting. The reboot could happen in V3 at very long weld times because the voltage at the Arduino Nano dropped to low dring the weld.
• SMD Mosfet Driver: the mosfet driver chip has been changed from the through hole version that was plugged in a socket to a SMD version that is directly soldered to the pcb. The SMD version eliminates eventual contact problems that could happen with the through hole version when it was not plugged in the socket correctly.
• SMD Mosfets: The mosfets have been changed from through hole version to SMD. That will eliminate the problem of failing mosfet legs in V3 on very high currents.
• new aluminum parts: there are still two aluminum parts used on the mosfet board but the parts are just straight and both the same size. This makes producing or modding them for DIY users much easier.
• Stronger Protection Diodes: The protection diodes on the bottom of the mosfet board have been changed to a much stronger version. They are rated for the same current as the ones in V3 but can take much higher short peak amps and have better heat dissipation because they are phisically bigger.