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This project article from Electronics-Lab describes a simple BJT and MOSFET transistor type and pin-out identifier device based on the PIC16LF1503 microcontroller. The device runs on a single CR2032 battery. The identified transistor type (PNP or NPN) and the pin configuration are displayed through LED indicators on board.
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Gabriel Francisco designed an automotive acceleration data acquisition system based on Texas Instruments’ LM4F120 series of ARM Cortex-M4 microcontroller. It can be used to sense automotive vibrations in eight directions using single channel analog accelerometers, such as ADXL335 device. The data collected from the sensors are sent to a PC through serial port or Bluetooth, and are analyzed through a PC software.
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Shane Soh and Eileen Liu, students at Cornell University, designed this acoustic wayfinding device to assist visually impaired persons with navigation. It uses two ultrasonic range finders; one is head-mounted navigation system and the other is a wearable tactile sensor unit plugged on to the user’s finger. The two systems work together to sense the surrounding physical space and instructs the user to turn left or right to avoid the obstacles detected in the field of view. The project uses ATmega1284 as the main controller and three MaxBotix MB1000 units as sonar rangefinders. The head-mounted navigation system consists of two ultrasonic
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This tutorial from Maxim describes the standard process of designing a radio system and various tradeoffs involved in the process. The process of designing a radio system can be complex and often involves many project tradeoffs. With a little insight, balancing these various characteristics can make the job of designing a radio system easier. This tutorial explores these tradeoffs and provides details to consider for various radio applications. With a focus on the industrial, scientific, medical (ISM) bands, the subjects of frequency selection, one-way versus two-way systems, modulation techniques, cost, antenna options, power-supply influences, effects on range, and protocol selection are explored.
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I found this design idea posted on EDN website, which is about using an externally heated semiconductor diode as an air or fluid flow sensor. The idea is airflow across the heated diode reduces its temperature, thus causing the voltage across the diode to vary with the rate of airflow.
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