Did you make a mistake while programming fusebits, or purposely disabled reset pin (RSTDISBL) or ISP programming (SPIEN)? No need to buy or make inconvenient HV programmer only for unlock couple of Tiny AVR’s. This Attiny fusebit HV doctor will cure your tiny microcontrollers, by restoring all fusebits to factory settings – nice and easy. Supports all of the serial high voltage interface AVRs, that is 8-pins: Attiny11, Attiny12, Attiny13, Attiny15, Attiny25, Attiny45, Attiny85, and 14-pins: Attiny24, Attiny44, Attiny84.
Simplest and cheapest LPT Logic Analyzer. Contains only a D-SUB 25 connector, 74xx245 buffer, and few wires. That’s it. Device is based on this site, there is also PC analyzer program. This device is not caching any samples like a expensive analyzers do, all samples are maked trough a LPT port input in real time and recorded on PC.
Acoustic spectrum analyzer for HD44780 LCD. This is version 2 of this device, version 1 was popular and you asked for some effects and options, so here it is :)
Simple meter on a HD44780 and Attiny13. This project has born from a pure curiosity – what we can made on this small uC? We can, and a lot. In this case this tiny will measure voltage, current, and temperature, recalculate, and in a nice way show on a 16*1 lcd. Despite on unusual solutions and few defects, it still can be used as a power supply meter. PCB dimension – only 35mm x 16mm
USB – RS232 converter, uses only Tx and Rx lines, with selectable 2400, 9600, or 38400bps. PCB projected to fit in old mobilephone cable, most of parts is surface-mounted. For more info see original autor Osamu Tamura site. Pcb’s, driver, and firmware is attached below.
Miniature version of LCD2USB device, a lcd driver connected to usb port. Because the original pcb was too complicated for home-make, i have projected new pcb – all parts is surface-mounted, pcb width is width of 16 pin connector which is fit exactly behind lcd. I used mini-usb connector, ATMega8 in TQFP package, and some of other SMT parts. As pcb is modified, it need modified firmware available for download below. Rest of description is available on original autor site.