If possible, I am thinking to put in an encoder later but the interations on taobao are much faster than mine.
And please don't forget to take some pictures of the PCB
Yes, shall do so when it arrives. For the time being, more screenshots:
About 21 euro, plus another or two euro to ship to Singapore.
But the order is stuck for at least 10 days because of China National Day(according to seller). Mastech canceled my other order of a new LCR tweezer. Got a feeling they are using Taobao to test demand, and also selling well ahead of their production. The LCR tweezer has been 2 months , nd still on pre-order status. But at least they did not reject my order this time.
I just finished the LCD master project schematic. Let me know if you find any errors or other stuff I should note before sending it off to KH.
But for some reason the rotary encoder doesn't work anymore. It works as a pushbutton now. To navigate the menu you click once to move next, press and hold to select, and press and hold to exit the selection.
Also I think I buggered one of the transistors now because with the battery plugged in, the LED and screen lits up without pressing the encoder.
I'm like the opposite of having the Midas touch.
I bought a latching button and just turn it off when the battery is plugged in. It turns on whenever its plugged in now.
But for some reason the rotary encoder doesn't work anymore. It works as a pushbutton now. To navigate the menu you click once to move next, press and hold to select, and press and hold to exit the selection.
Also I think I buggered one of the transistors now because with the battery plugged in, the LED and screen lits up without pressing the encoder.
I'm like the opposite of having the Midas touch.
I bought a latching button and just turn it off when the battery is plugged in. It turns on whenever its plugged in now.
Hi penmarker, I think you are really close to solve all the issues!!
Most probably the culprit is one of the transistors in the power section.
Since the tester is responding to the push button of the encoder, T2 should be fine.
Try to remove T1 and T3 verifying that T1 is really a PNP and T3 is NPN.
Verify also that base, emitter and collector are correctly oriented (refer to the schematic and ignor silkscreen) since similar transistor can have different pinout (base not in the middle).
Mauro
...for some reason the rotary encoder doesn't work anymore....
...I'm not sure but I think my display is the ST7735.
I loaded the arduinoISP sketch into the arduino and this is as far as I got. I can't figure out the command line string for avrdude to use the arduino and I'm not sure where I need to put the .hex and .eep files I downloaded. Please help!