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Category Archives: diy
A few more PCBs, this time for Freescale’s sensors. MMA8541Q The MMA8451Q is a low-power, three-axis accelerometer with 14 bits of resolution. It communicates over I2C, has built in tilt/orientation detection and also tap detection. To make the PCB I downloaded the … Continue reading
Hace unos años (varios, unos 6….) conseguí por medio del programa de Muestras Gratis de Freescale unos micros de la linea HC08. Comencé a investigar de que forma programarlos, que interfaz de programación construir, que software utilizar, etc. En el … Continue reading
Another small board, this time for a INA219. The INA219 is a high-side current shunt and power monitor with an I2C interface. For testing I used Rei VILO library with a MSP430G2553 and Energia, and I measured the power consumption for this simple circuit: … Continue reading
I made a little board for a SHT21 humidity and temperature sensor from Sensirion. There are several versions with I2C interface, PWM output and SMD/analog interface. I’ve got the one with Sigma Delta Modulation (SMD) output, is a bit-stream of pulses; the … Continue reading
I have a few MSP430G2955 around but non of my Launchpads are capable of programming this MCU. Texas Instruments released a while back all the informtation needed to build the new ez-FET lite. The eZ-FET lite is a low cost USB-based … Continue reading
I build a more permanent version of the pulse generator with some changes. The comparator wasn’t working very well with the 1V reference I was using. I made some measurements with different voltage references and got this: Vref Vfeedback Vout(measured) … Continue reading