"you dont know what your talking about."
Yes I do. But that's one of us....
"the kit IS a real colour lcd."
I thought that #2 was a monochrome LCD with a dark background and yellow text.
There are others I see with just the green or blue backlit screen with boring black text.
Hence the confusion.
So I ask will the #2 unit be able to display as the #1 unit in multiple colors and the same format? And can the #1 photo be adapted to include the rotary encoder, or is that software prohibitive?
this one works - if you cant make it work then your programming it wrong.
Please, I need help.
I have put together this kit from http://www.aliexpress.com/item/2016-DIY-kits-TFT-LCD-M328-Transistor-Tester-LCR-Diode-Capacitance-ESR-voltage-meter-PWM-Square/32649811953.html?spm=2114.13010608.0.93.OBbTox I had to solder the three protection smd parts myself. Kit does not include test capacitor.
With 9v batt plugged in DC jack and encoder pressed down, there is 235mA draw from batt. The T3 labeled 9012 gets hot . 0 volts on socket pin 7. In circuit the 9012 and two 9014 transistors test good. The 5v reg 7550A-1 shows shows some voltage drops on every pin in both ways.
I have dis-soldered the LED and surge suppressor but no help.
Any ideas?
Update:
Thanks to stj for pointing it out, I soldered the SRV05-05 front to back. Once removed device worked!
Please, I need help.
I have put together this kit from http://www.aliexpress.com/item/2016-DIY-kits-TFT-LCD-M328-Transistor-Tester-LCR-Diode-Capacitance-ESR-voltage-meter-PWM-Square/32649811953.html?spm=2114.13010608.0.93.OBbTox I had to solder the three protection smd parts myself. Kit does not include test capacitor.
With 9v batt plugged in DC jack and encoder pressed down, there is 235mA draw from batt. The T3 labeled 9012 gets hot . 0 volts on socket pin 7. In circuit the 9012 and two 9014 transistors test good. The 5v reg 7550A-1 shows shows some voltage drops on every pin in both ways.
I have dis-soldered the LED and surge suppressor but no help.
Any ideas?
Update:
Thanks to stj for pointing it out, I soldered the SRV05-05 front to back. Once removed device worked!
I have this same kit, which came with the SMD components pre-soldered , so it was pretty simple to assemble.
But it does not work when I press the encoder button (long or short) the LED flashes briefly and the display backlight flickers, but that's all..
Power is present where you'd expect it, so the regulator works.
So I was thinking maybe the display is defective and I wanted to hook it up to an arduino to test.
I figured it must have a ST7735 driver, but I cannot get the pinout correct, it does not match the only ST7735 from config_328.h.
Does anyone know the pinout of the display ? The schematic matches what I measured, but what function is where..
AT328 pin disp.pin
PD0 2 LCD_? 2
PD1 3 LCD_? 3
PD2 4 LCD_? 5
PD3 5 LCD_? 4
PD5 11 LCD_? 6
Thanks, I could give that a try. I see a lot of firmware's in this thread , do you know which one I'd need for this specific tester ?
Thanks, I could give that a try. I see a lot of firmware's in this thread , do you know which one I'd need for this specific tester ?
On page 93 post 2322 by stj has latest. Try the AY-AT
Hi vinceroger, stj,
Thank you for detail information, obvious I am doing something wrong when programming the chip with TL866.
Hi vinceroger,
Thank you very much finally the tester works!
The problems was that I had programmed the TransistorTester.eep like binary not hex.
My version works fine (transistors, capacitors, resistors) but results for small inductors are sometimes weird, for example 128 Mohm or 18 pF instead of 25 uH. There are photos attached. I do not know what is going on. Adjustment procedure: done and save. Shoud I use another power supply, firmware or better linear regulator? Sometimes it helps when I touch GND during "probing" appears.
Firmware version: Markus 1.24m trendy,
Microcontroller: Atmega 328P @ 16 Mhz crystal,
AREF capacitor = 1 nF,
2,5 VDC voltage "reference" = L1117-25C (I know should be LT1004)
Power supply: 12 VDC switched mode + 7805 linear regulator.
Thanks, I could give that a try. I see a lot of firmware's in this thread , do you know which one I'd need for this specific tester ?
On page 93 post 2322 by stj has latest. Try the AY-AT
Thanks, I could give that a try. I see a lot of firmware's in this thread , do you know which one I'd need for this specific tester ?
On page 93 post 2322 by stj has latest. Try the AY-ATI had a bit of trouble to get avrdude to work, needed to hook up a crystal to be able to communicate with the 328. Once I could communicate I found the fuses for external crystal were indeed set, but flash was empty and there was some data in the eeprom.. Very strange, don't know what happened with that chip.
Then I could write the flash/eeprom/fuses and it verified ok.
It did make a difference; only the backlight lit up and nothing else happened Then I found that there was only power to the chip and display while the button was pressed.
Turned out I swapped the 3k3 and 33k R7/R10 voltage divider resistors in the power circuit
After fixing that (man it's difficult to desolder parts from a double sided PCB..) it's WORKING
Thanks for your support guys !
Original firmware had 1mhz, 2mhz, and others...
btw, i did put up a thread for several weeks asking people what frequency's would be usefull - not one reply!!
so i put the 50 & 60 Hz mains timebases and rectified derivatives in, together with a couple of tuning frequency's used by musicians.
it was a seperate thread on a different forum.
the 50/60/100/120Hz is very usefull, because you can test stuff that normally gets timing pulses from a mains transformer.