ATtiny841 development board w/Optiboot, arduino compatibleDesigned by Azzy's Electronics, Ships from United States of America
This is a simple development board for the Atmel ATtiny841. It provides the familiar 6-pin FTDI header for connecting to serial and ISP header for programming via ISP, with DTR auto reset. This boa...Read More…
This is a simple development board for the Atmel ATtiny841. It provides the familiar 6-pin FTDI header for connecting to serial and ISP header for programming via ISP, with DTR auto reset. This board is sold assembled, with all surface mount components soldered down, and chip bootloaded with Optiboot. Boards are sold in three versions - 16mhz, with crystal and 5v LDO regulator, and 8mhz w/out external crystal and either 5v or 3.3v LDO regulator. ENIG (gold) surface treatment for easy soldering on 0.063" FR4.
Using the core available from my Github at https://github.com/SpenceKonde/arduino-tiny-841 the ATtiny841 can be used with the Arduino IDE, with optiboot bootloader support.
What sets this apart from a typical ATtiny841 breakout board or generic SOIC-14 breakout board is that it provides the appropriate header for serial programming of an ATtiny841, and the chip comes pre-programmed with the Optiboot bootloader, so programming it with the Arduino IDE is as simple as using an Arduino Pro Mini (You can always erase the bootloader by programming via the ISP header if you need the space and/or wish to program using Atmel Studio instead of Arduino). As of 11/16/2018, these are preloaded with a new version of Optiboot (from ATTinyCore 1.2.1) which does not interfere with using the WDT as an interrupt source - the largely-unused EE_RDY vector is used for virtual-boot instead.
The ATtiny841 is pin compatible with the classic ATtiny84, however, it has a greatly improved suite of peripherals. In addition to the dual hardware serial - by far the most exciting feature - it has full master/slave SPI (not a USI), and a second 16-bit timer, allowing 6 PWM outputs. The analog input capabilities are also greatly enhanced, with dual on-chip analog comparators, analog input on every pin, and almost every imaginable combination of pins available as a differential pair, with gain of 1x, 20x or 100x - few AVRs have a more capable ADC!
This board is sold ASSEMBLED but WITHOUT PIN HEADER - Bare boards available here
This board has the standard Arduino-style DTR autoreset circuit: The DTR pin of the serial header is connected, through a 0.1uF capacitor, to the reset pin, so that when the serial port is opened (whether to upload code or connect a serial monitor tool), the chip will reset. This can be disabled by cutting the trace marked RST_EN - if this is done, a 2 pin 0.1" pin header can be installed in the adjacent holes, and bridged with a jumper to temporarily re-enable it.
A CH340G-based serial adapter is available as an option. This will be supplied with a 6-pin cable as shown. These are mass production adapters, however they are a cut above the most common units, and have a switch to select 3.3v or 5v operation. They break out the pins necessary for programming one of these breakout boards, or an Arduino Pro Mini or similar - Vcc, Gnd, TX, RX, DTR and CTS.
For a fancier CH340G adapter which breaks out all pins, check out my own CH340G-based design.
Custom options are available for regulator and crystal - specify in order comments what regulator voltage and crystal you want. Note that at voltages above 4-4.5V, the internal oscillator runs too fast for UART communication, so the bootloader will not work and this configuration is not recommended. If you want a chip set to use the internal oscillator, and >3.3v regulator, please acknowledge that you are aware of this issue in the order comments (else I will contact you to confirm, which could delay your order).
Available custom speeds are internal 1mhz or 8mhz, or external 7.3728, 8, 9.216, 11.0592, 12, 13.56, 14.318, 14.745, 16, 18.432, and 20mhz, and operating voltages of 1.8, 2.5, or 3.3v or 5v. Please refer to fig 25-27 on pg 248 of the datasheet for max rated clock speed at a given voltage - if you are requesting a crystal which is faster than the manufacturer spec for the regulator voltage, please acknowledge in order comments that you know that you're asking for a board that is outside manufacturer spec (otherwise I will contact to confirm, which could delay your order).
Please allow 1-3 days extra processing time for all custom orders.
|Shipping Rate||First item||Additional items|
United States Postal Service: First Class Tracked (recommended, cheaper than economy for 5+ items)
United States Postal Service: Priority Mail - Flat rate (fastest, tracked)
Domestic shipping via USPS Priority Mail - USPS advertises 1~3 day shipping time within the continental United States. This is a flat rate for any quantity of items - this is your chance to buy piles of small cheap items like my mini prototyping boards without paying extra for shipping!
Rebeca | Feb. 7, 2019
John | Sept. 22, 2016
Paul | March 13, 2016
Josh | June 29, 2015
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I build projects with Arduino (ATtinies almost exclusively, never anything bigger than a '328p) and Espruino (often both working together), and I make a lot of circuit boards for these projects. Particularly after using my ATtiny-prototyping board for my own projects, I realized that these would be useful to other people, and decided to start selling them here on Tindie.
Strip Board, Protoboard, prototyping board, solderable breadboard - whatever you want to call it - it has been a mainstay in electronics prototyping for decades, and hasn't changed much in the interim (not even in production quality, as they're still often single-sided and/or manufactured from low-grade phenolic resin instead of FR4). My prototyping board creations bring these into the modern era, offering a combination of 0.1" through-hole prototyping areas (consisting of groups of 2, 3 or 4 pins connected together, like solderable breadboard) and pads for common surface mount packages connected to through-holes for easy soldering. To handle projects of all sizes, I offer prototyping board as large as 4" x 4", down to less than an inch square in my Mini Protoboard line. Unlike most commercial prototyping board, these boards are made to the same quality standards as real PCBs. Through-holes are plated, and the boards are double sided. These are offered in both generic versions, and ones tailored to specific microcontrollers, like the Tiny84/85, or microcontroller boards, like the Espruino Pico, Arduino Pro Mini, and the wildly popular ESP8266.
ATtiny breakout boards:
I love the ATtiny lineup, particularly some of the less popular ones, like the incredibly full-featured ATtiny841, ATtiny1634, and ATtiny828. Breakout boards for these that had the features I wanted were not readily available - so I made my own. I've since expanded my product line to include breakout boards for the ATtiny861, ATtiny167, and ATtiny88 - and all of these are available both as bare boards and assembled. In addition to designing the hardware I also maintain [ATtinyCore Universal](https://github.com/SpenceKonde/ATTinyCore), which enables Arduino support for all these ATtiny's and more.
I also sell a number of other boards to fill what I felt were gaps in the market, including a breakout board for the popular LoRa/LoRaWAN modules from Microchip (the RN2483 and 2903), which has become one of my top selling items. I also sell MOSFET drivers and breakout boards for logic level MOSFETs operating at logic levels of 2.5v and lower - while a great number of MOSFETs are available that operate with very low gate voltages, these are almost invariably SMD parts which are difficult to use without a properly designed breakout board.