Looking for someone to help us debug why our bootloader process (using arduino IDE and mkii) is not working consistently.
We designed a very simple arduino pro mini (almost exact, moved a few pins around) and are having erratic results on programming the bootloader. It uses the atmega328p au (smd TQFP) chip.
We have scoped it, and found in most failed cases, the SPI clk is ok, MOSI going in ok, and MISO coming out seems to be not responding, or very weak signal at best on the failed units.
Ironically, the same board, parts kit, sometimes works flawlessly. We are using a mkII atmel ISP programmer. (same results using arduino UNO)
Thinking of building a fixed jig with zif TQFP adapter to test as isolated as possible the atmega328p AU chip only. Putting in an oscillator as optional element in case chip is set to external clock ?
Looking for someone more familiar with all the possible pitfalls of a TQFP chip, and ways of isolating loading/setting fuses, and help us prep for a production run.
We can provide parts/schematics/layouts, and current errors.
Like to get a fixed bid, on a set of troubleshooting techniques , and exploring some of our working/not working chips. Expect to pay for a time block of hours, that could be estimated to troubleshoot our scenario, and perhaps make the jig for us as well.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Maker Business — Robotics manufacturer Anki is stripped for parts
Wearables — Form a flame
Electronics — Calc that whip!
Biohacking — Vitamin-C + Gelatin for Accelerated Recovery
Python for Microcontrollers — A SuperCon was HaD! Arm AIoT Dev Summit is almost here, and more! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit
Adafruit IoT Monthly — Helping Harry's Heart, CircuitPython meets AWS IoT and more!
Microsoft MakeCode — Lenticular Art Display with Crickit
Sorry, the comment form is closed at this time.