Category Archives: English

Freescale’s sensors breakout boards

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

Posted in diy, Electronics, English, FXOS8700CQ, MMA8541Q, MPL3115A2, pcb, sensor | 6 Comments

INA219 Current Sensor DIY Breakout board

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

Posted in diy, Electronics, English, pcb, sensor | Tagged , , , , | 2 Comments

SHT21S DIY Breakout board

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

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DIY ez-FET lite…ghetto style

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

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Avalanche pulse generator- part 2

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

Posted in diy, Electronics, English | 5 Comments

Avalanche pulse generator- part 1

I wanted to make a fast pulse generator like the one designed by the great Jim Williams1. Unfortunately, the required chip for the high voltage power supply (LT1073) is not available where I live. I found several similar circuits using … Continue reading

Posted in diy, Electronics, English | 2 Comments

Constant Current Electronic Load

I’m building a power supply and an electronic load might be useful for testing it, so I made one. The design is based on some of the various diy electronics loads out there (like the one from Dave Jones). The … Continue reading

Posted in diy, Electronics, English | Tagged , , | 3 Comments