ATMEGA4808 megaAVR Mini Dev. Board, Arduino Compatible
$4.50
- Description
- Additional information
- Reviews (7)
- Enquiry2
Description
This chip is from the family of new generation of the ATMEGA megaAVR 0 series, and it has a lot of exciting features.
- Incredible price point
- Multiple serial ports, SPI and i2c interfaces
- Built-in programmable logic, UPDI one wire programming interface, programmer can be built from arduino nano or similar
- Up to 16 analog input pins
- An analog comparator with a built-in programmable voltage reference and hysteresis
Board Features:
- Atmega4808 TQFP-32 microcontroller:
- Arduino bootloader supported
- 48KB Flash, 6KB RAM, 256B EEPROM
- 3x serials, 27 IOs
- Power supply LDO support up to 18V 500mA on 5V and 3V3
- On board USB-TTL bridge:
- Supports arduino serial auto download
- TXD/RXD status LEDs
- Upload via atmega4808 UART2 alternative pin PF4/PF5 (D24/D25)
- For programming do serial2.begin() and swap(1) for alternative pins
- One general programming led D7, one reset button
- Lead out all pins from the chip
- On board backside power supply can be selected between 5V or 3V3
- On board backside ED-BTB board to board socket:
- Plug to play and use our any other compatible modules here.
- If you don’t need this you can add order note to remove it
- Board pin definitions compatible with software MCUdude/MegaCoreX
Additional information
| Weight | 0.01 kg |
|---|
Stefan (verified owner) –
Nice board, works out of the box with MegaCoreX (RTFM :-). Looks a bit crusty, so may be, it was too long in the oven, and has a diode more than on than on the product photo. May be something with the 3V3? Is it for the board-connector on the back if you want to drive an ESP? I don’t know. Looks interesting, but can annoy when you want to put the board flat on something. Price is OK, shipping time to Germay was great! Access to the schematic is wonderful. I love the CH340K. I will exlore this board and fully recomment it!
Stefan (verified owner) –
Missing the chapta for upload 🙁
Chao (store manager) –
Thanks for the feedback!
The diode is betweent Reset and 3.3V, better have it, but also no problem if not have it.
We will also keep the back connector not soldered, but included, it is indeed a problem to put it on the table and not flat laid. Thank you again!
electrodragon@stefan-schulte.de (verified owner) –
Fast shipment again 😉
And I think I found a mistake on the sikscreen: D24 is D23, korrect?
Chao (store manager) –
Hi, yes is is the error, the D24 should be D23, wrong print, I will try to fix in the future production. Thank you!
Louis (verified owner) –
I received two Atmega4808 boards yesterday and I could not program in either Arduino IDE or PlatformIO.
Please give examples of how to setup in both Arduino IDE and PlatformIO.
I have tried JTAG2UPDI in Arduino and jtag2UPDI but no success.
Thanks so much,
Louis
Neil (verified owner) –
This would be a perfect 4808 development board except for the fact that it won’t fit a standard 0.1″ pitch breadboard. The distance between the header pin rows is 0.75″/19mm rather than a multiple of 0.1″.
That said, the board is still fine for my purpose as I wanted a basic working 4808 board to experiment with UPDI programming and testing functions of the 4808 chip before making my own custom board. I can do this with dupont cables directly off the header pins.
The board powered up from the USB port first time and is running some internal code that flashes the LED so it can be seen to be working. The voltage default is set to 3.3V so I had to remove the solder power jumper and change to 5V for my purposes.
It would be useful to have a complete circuit diagram to see how the power supplies and reset circuit works, there is only a pinout and connections to the 4808 shown in the information. (there is a 100nF cap to reset from the RTS pin on the serial port, so the board resets when the serial port is opened)
The expansion connector on the back of the PCB was not fitted to my boards. This was ideal as I don’t need it.