At the fpv-community.de Forum I read about a DIY Weller station designed by Martin Kumm. Basically an Arduino shield to drive a Weller soldering tip. As there is not much to it, the board simply contains an precision OpAmp, a power MOSFET, 2 buttons for adjusting the temperature and a display to show the current values. This design looks like a good starting point for my own advanced project. As I have lately discovered a 1,8 inch SPI TFT at banggood.com for an amazing price ( ~ 4.60 $ / 3,70 €), I started using them regularly in my projects. So I surely wanted to use it with this soldering station as well.
The hardware design was rather hobbyish and needed to be tuned to provide the security not to kill your soldering tip while starting up or in case of a software/hardware fail. The bigger changes I made to the original design were the nice color Display, a poti instead of the buttons (I think it’s easier to adjust) and a standby mode.
The standby mode will decrease the temperature to a 170°C value when the soldering tip is in the holder. This works simply by having a pullup resistor connected to the metal holder pipe which is connected to a digital input. The soldering tip itself is connected to ground potential and will put the digital input to ground level as well when placed in holding position. For reheating the station only takes about 3 seconds which is fast enough in most cases.
For more detail: Soldering Station
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- pic soldering station
- microcontroller controlled soldering station
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