Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

The Innovative RS-232 Frequency Meter

You would like a simple frequency meter that doesn’t have any front panel controls on it? Well, this RS-232 frequency meter might be your right choice! For your information, this RS-232 frequency meter is based on Atmel AT90S2313, and the you can interacts via an RS-232 terminal program at 9600 baud. With this unique frequency meter, you can apply some straightforward code to read the 16 bit counter in the AT90S2313, where it was determined by running a timing loop through it! In this project, you can try various approaches using interrupts from the 8 bit timer to set the counting interval. However, you’ll find that the timing will become uncertainty resulted in intolerable jitter in the measurement. Normally, the results of the counts are mostly converted to ASCII and being sent to the terminal. By the way, you must realize one important thing here that only half the Flash ROM was used and you can fit a handy pulse generator program into the same chip. Therefore, the result is a combined counter and frequency meter, where the chip flips… Continue reading

The Multiple Useful USB7

For those of electronic fans/lovers, you must very familiar with the LED display stuff. Well, today I would like to introduce you this USB7, which it can be used in multi electronic tasks. The USB7 is a six-digit LED display, and it is normally controlling by a USB virtual COM port. The USB virtual COM port (AVR-CDC) is an USB-RS232C interface that using CDC (Communication Device Class) protocol on USB 1.1. The biggest advantage of using CDC is its can works extremely well on low speed USB with slower speed (This mean with an ATtiny 45 enough to accelerate the 4800bps 8N1) and thus, we can save a lot of money as the ATtiny 45 is so far is the cheapest component for USB-232C interface type project. Some of the cool features for USB7: Simple ASCII code that enables it’s to controls all display functions The all through hole parts and pre-programmed microcontroller features The kits are provide in three colors, with standard 0.56″ common anode display format The PCB available in: Regular Version and With Mounting Holes Version. Grab… Continue reading