Wednesday, August 10, 2016

TFT LCD Touch Screen - ILI9341

I tested a 2.4 inch 240 x 320 resolution TFT LCD touch screen bought from Aliexpress.

That module has LCD display, touch input, and SD card reader. I have written some example programs to use that module and they are available at the following link.

Thursday, July 7, 2016

Motor Driver - DRV8834

I am designing a motor driver to drive a stepper motor AM1020-V-6-65. At first, I thought to use A4988 from Allegro. But its supply voltage of 8V - 35V is not suitable for a 6V motor, its chip size 5 mm x 5 mm is bigger than what I want. DRV8835 from TI has appealing 2 mm x 3 mm size but it is meant for DC motor and there is no indexer to support convenient control of stepper motors. Finally, DRV8834 with 4 mm x 4 mm size, motor supply voltage 2.5V - 10.8V, and current 1.5A per coil is chosen.

Wednesday, May 18, 2016

Thursday, May 5, 2016

DRV2700 Piezo Driver

DRV2700 is a single chip Piezo driver which is 4 mm x 4 mm x 0.9 mm in size. It can be used in 100 V boost or 1 kV flyback configuration. Supply voltage is 3 V - 5.5 V. In this article, evaluation of DRV2700EVM module is discussed.

Figure. Testing DRV2700.

Thursday, April 21, 2016

Low Pass and High Pass Filter

I would like to wite a note about simple first order RC circuits.

Figure. Low pass and high pass filter.

Tuesday, April 12, 2016

Using 3rd party CC2530 modules

I would like to talk about 3rd party CC2530 modules - ( a first one and a second one ) that I bought from Aliexpress. In a previous article, I talked about CC2530DK from TI. In this post, using SmartRF05EB to debug 3rd party module is discussed.

Figure. A small CC2530 module whose size is 13 mm x 18 mm.

Thursday, March 24, 2016

Gyroscope L3G4200D

L3G4200D is a MEMS ultra-stable three-axis digital output gyroscope made by STMicroelectronics. A L3G4200D Module in Aliexpress costs only about $3.

Figure. L3G4200 Gyroscope module

Friday, January 1, 2016