by Elliot Williams August 01, 2016
Atmel put out some new, small microcontroller chips early this year, and we’re just now starting to think about how we’d use them. The ATtiny102 and ATtiny104 (datasheet) sell for about a buck (US) and come in manageable SOIC packages with eight and fourteen pins respectively. It’s a strange chip though, with capabilities that fit somewhere between the grain-of-rice-sized ATtiny10 and the hacker-staple ATtiny25-45-85 series.
The ATtiny104 has a bunch of pins for not much money. It’s got a real hardware USART, which none of the other low-end AVRs do, and it’s capable of SPI in master mode. It has only one counter, but it’s a 16-bit counter, and it’s got the full AVR 10-bit ADC instead of the ATtiny10’s limited 8-bit ADC. The biggest limitation, that it shares with the ATtiny10, is that it has only 1 KB of program flash memory and 32 bytes (!) of RAM. You’re probably going to want to program this beast in assembler.
Read on for more reviews, and check out [kodera2t]’s video review at the end.
by Elliot Williams July 30, 2016
[Bruce Land] switched his microprocessor programming class over from Atmel parts to Microchip’s PIC32 series, and that means that he’s got a slightly different set of peripherals to play with. One thing that both chips lack, however is a digital-to-analog converter (DAC). Or do they? (Dun-dun-dun-duuuuhnnnn!)
The PIC part has a programmable, sixteen-level voltage reference. And what is a
Vref if not a calibrated DAC? With that in mind, [Bruce] took to documenting its performance and starting to push it far beyond the manufacturer’s intentions. Turns out that the
Vref has around 200 kHz of bandwidth. (Who would update a …read more
by Joshua Vasquez July 29, 2016
If you’re an active shopper on RC websites, you’ll find tiny motors spec’ed at hundreds of watts while weighing just a few grams, like this one. Sadly, their complementary motor controllers are designed to drive them at a high speed, which means we can only hit that “520-watt” power spec by operating in a max-speed-minimum-torque configuration. Sure, that configuration is just fine for rc plane and multicopter enthusiasts, but for roboticists looking to drive these bldc motors in a low-speed-high-torque configuration, the searches come up blank.
The days in the dust are coming to an end though! [Cameron] has been …read more
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