Cheap tools from China are even better with open source firmware upgrade

1. Cheap, good, hackable tools
from China:
AVR component tester
Dobrica Pavlinušić
http://blog.rot13.org
HrOpen, HULK
2015-05-19 #dorscluc

2. My first junk box...
All youtube videos have handy junk box which I
don’t have! How can I get one?
junk ⇒ desoldering iron, flux pen, solder wick
⇒ junk box ⇒ component tester ⇒ parts bin
junk ⇒ parts without web search!

3. My Junk box - somewhat sorted

4. Parts bin with eBay and Banggood stuff

5. ● What is that transistor-like component from
my junk box?
○ NPN? PNP? N or P channel MOSFET?
● Markus Frejek wanted to do it with AVR
● Karl-Heinz Kübbeler and others extended it
http://www.mikrocontroller.net/articles/AVR-Transistortester
Motivation

6. Learning opportunity

7. Transistor tester ebay search
Which one to buy?! $15-30

8. Partial features list
● ATmega8, 168, 328, 644, 1284, 1280 or 2560
● 2*16, 4*16 LCD or 128*64 pixels ST7565,
ST7920, ST7108, KS0108 or a SSD1306
● Automatic detection of NPN and PNP
bipolar transistors, N- and P-Channel
MOSFETs, JFETs, diodes, double diodes,N-
and P-IGBTs, Thyristors and Triacs.
● resistor and capacitors measurements
● 36 features in current version!

9. But, isn’t this DIY project?
It can be DIY. But you can also buy kits if you
don’t want to make own pcb or source parts!

10. AVR component tester

12. how to drive this solenoid
from printer found on junk?

13. What is this sensor from old printer?
Some kind of end-stop with LED?

14. Hardware
ATmeta328p
but not Arduino :-)

15. mega328_fish8840
ISP pinout
unused pins

16. minimal modifications of
mega328_fish8840 Makefile:
CFLAGS += -DLCD_ST7565_V_FLIP=1
CFLAGS += -DVOLUME_VALUE=50
CFLAGS += -DFONT_8X8

18. solder to TP1,2,3 on ZIF and hot glue for the win!

19. Meeds small patch for stand-by power
consumption

20. Wjat about two un-used pins?
Check pins continuity using unimer

21. ATmega 328p pinout

23. Fail-of-the-weel: rotary encoder modification...
...i will keep trying ;-)

24. And software?
Something Linux related?

25. $ vi Makefile && make flash
avrdude USBasp/avrispmkII
ArduinoISP on Arduino Uno would work as well

26. Hints for all versions
● Connect all three inputs together and power on to start
self-test (confirm in 1 second)
○ this will display software version in the end
● Hold test button for 3 seconds on power-on to enter
menu with additional options
○ transistor TP1:3
○ frequency PD4/LCD-RS pin, needs 270Ω hardware
mod or circuit from documentation
○ f-Generator 1Hz-2MHz ; TP1 GND ; TP2 signal 5V
/ 680Ω ; TP3 680Ω GND
○ 10-bit PWM TP2
○ C+ESR@TP1:3
○ rotary encoder, Selftest, Switch off

27. Hack your tools!
it’s nice to have source code of code
which runs on your tools
AVR component tester is not only example of
hackable cheap tools from China!

28. IMAX B6 battery charger
https://github.com/stawel/cheali-charge

29. AVR IMAX B6 clone $30-40

30. Nuvoton NuMicro M0517LBN CPU - ARM SWD https:
//github.com/sasam/M0517_flash_tools
https://github.com/hackocopter/SWD-Hacking

31. Questions?
#dorscluc @dpavlin
Or practical hands-on with component tester
for those interested….