The fix is easy, just a small wire from stm32 pin 1 connected to the RTC battery pin.
Why? I don't know,aybe longer battery life.
For lower noise, don't use a 24->3.3V buck converter, better 24->5V, then use a LDO to lower it to 3.3.
Internal NTC will cause higher temperature drift, as you're designing it from scratch there's no excuse to do it right.
If I have room for the second regulator, plus just having a SMPS on the board could be an issue. We'll see.
QuoteIf I have room for the second regulator, plus just having a SMPS on the board could be an issue. We'll see.
There are a lot of buck converters compatible with 7805 pinout. I used it successfully in my custom controller (5V version and 3.3V LDO), you can also use WE 173950536 or something similar.
T12 handles compatability is a real pain, mine are all rewired to the same pinout and with the same NTC.
Not a big problem with NTC because you can switch beetween 10k/100k in FW or disable it completely, but it can be very difficult to find a stand that fits...
BTW I think it is worth to consider T245 also, it is a bit more expensive option, but heat up time is excellent.
What NTC do you use? 10K, but several different options exist.
When you say "stand' you mean the thing you rest the handle in when not using it?
The T245 doesn't have a thermistor iirc, I planned to have one on the board and jumpers to snip to choose, so that it not an issue.
I also think there is no shake function on the T245? Does the firmware support it? I have no interest if not. I hate programming.
Any (small) 10k NTC with known beta will be good.
That's a good idea, I've got possibility to mount NTC directly on PCB but with T245 I've mounted it in a connector.
FW supports shake mode and stand mode as well (T245 doesn't have vibration switch, placing handle in stand triggers standby mode).
That's a good idea, I've got possibility to mount NTC directly on PCB but with T245 I've mounted it in a connector.
FW supports shake mode and stand mode as well (T245 doesn't have vibration switch, placing handle in stand triggers standby mode).
I was asking if the firmware and hardware supported the T245, obviously the wiring needs changed a bit.
Daves firmware does support the T245, when it comes to hardware the KSGER and Quickos and others that use similar boards can support either handle, but it takes modification (remove a trace) which I believe essentially makes it unable to be returned to be used in its original configuration. Someone had a great idea, a page or two ago, that if you went with a 6 pin output, that would allow easy switching between a T12 handle and a T245 handle without modifying the hardware or use other means of "non-destructive" hardware methods of changing handle configurations that would likely require someone to open the station to do so (like using jumpers or a switch). Of course that would mean people who built your design would have to either get a new connector for their handles or use a patch cord if they use their handles on different stations that use the 5 pin connector.
Just a thought.
Good luck.
Putting it in the connector makes a lot of sense. Should be close to room temp, but doesn't catch the handle getting hot.
Putting it in the connector makes a lot of sense. Should be close to room temp, but doesn't catch the handle getting hot.No, the thermoelectric effect of the tip probe ends in the socket, where the tip is connected to the handle.
The generated voltage is based on the temperature difference between the hot and the cold part across the whole tip.
So, you want to read that junction temperature, not in the board or the connector.
If the handle gets to 45ºC, but you put the sensor somewhere else at 25ºC, you'll have a drift of 20ºC.
Daves firmware does support the T245, when it comes to hardware the KSGER and Quickos and others that use similar boards can support either handle, but it takes modification (remove a trace) which I believe essentially makes it unable to be returned to be used in its original configuration. Someone had a great idea, a page or two ago, that if you went with a 6 pin output, that would allow easy switching between a T12 handle and a T245 handle without modifying the hardware or use other means of "non-destructive" hardware methods of changing handle configurations that would likely require someone to open the station to do so (like using jumpers or a switch). Of course that would mean people who built your design would have to either get a new connector for their handles or use a patch cord if they use their handles on different stations that use the 5 pin connector.
Just a thought.
Good luck.
So, you want to read that junction temperature, not in the board or the connector.
If the handle gets to 45ºC, but you put the sensor somewhere else at 25ºC, you'll have a drift of 20ºC.
Everything is sampled with tip power off. I can't understand how this would affect the layout?
Just copy any Quicko/KSGER design, but with better op-amp, ground planes, power decoupling and regulator design. I won't be making custom firmwares!
Do you expect your board to be better than Ksger when you're placing the lower vias posible?
Why not do it properly and order to jlcbpcb.
You can fit 3x pcbs in 120x102mm, so you'll get 15 PCBs for ~$4 including shipping.
Hi everyone. Long time not loged in.
I was using one stm32 based board v2.1s with a jbc c210 tip.
Now i need a duplicate of that. I have the same board but with some reason, i can not access the MCU. The error is "read protection turned on". Can't read, can't write. MCU version is STM32F103. If i replace the STM, is it possible to copy the firmware from the other STM into the new one? In this case it will copy also the tip parameters stored in the old STM? Or do i have to calibrate again?
I wouldn't do that, i burned already 2 jbc tips when tried to calibrate... 😔
Can't read, can't write.