Using Simple Hall-effect Sensor as a position Sensor

 

The AH1806 is a high-sensitivity, micro-power Omnipolar Hall effect switch IC, designed for portable and battery powered consumer to home appliance and industrial applications such as smart-meter magnetic tamper detection

Digital Proximity, Ambient Light, RGB and Gesture Sensor

 

The APDS-9960 device is equipped with cutting-edge capabilities such as Gesture detection, Proximity detection, Digital Ambient Light Sense (ALS), and Color Sense (RGBC). This compact chip features a 2C-bus Fast Mode Compatible Interface with an address of 0x39.

Noteworthy Features:

- Comprehensive Ambient Light and RGB Color Sensing, Proximity Sensing, and Gesture Detection in an Optical Module

- Ambient Light and RGB Color Sensing:

  - Equipped with UV and IR-blocking filters

  - Programmable gain and integration time

  - Exhibits very high sensitivity, making it ideally suited for operation behind dark glass

- Proximity Sensing:

  - Precision-trimmed to provide consistent readings

  - Offers ambient light rejection and offset compensation

  - Includes a programmable driver for IR LED current and a saturation indicator bit

- Advanced Gesture Sensing:

  - Incorporates four separate diodes sensitive to different directions

  - Provides ambient light rejection and offset compensation

  - Features a programmable driver for IR LED current and a 32-dataset storage FIFO

  - Utilizes an interrupt-driven I2C-bus communication

- I2C-bus Fast Mode Compatible Interface:

  - Supports data rates of up to 400 kHz

  - Includes a dedicated Interrupt Pin

- Compact Package: L 3.94 × W 2.36 × H 1.35 mm

Ultra-Precise, Current-Sense Amplifier

 

 

This circuit uses Texas Instruments' ultra-precise current-sense amp, which can measure voltage drops across shunt resistors over a wide common-mode range from 2.7 V to 120 V. The amp is available in a highly space-efficient SC-70 package with a PCB footprint of 2.0 mm x 2.1 mm. It achieves ultra-precise current measurement accuracy due to its ultra-low offset voltage of ±12 µV (maximum), a small gain error of ±0.1% (maximum), and a high DC CMRR of 160 dB.

Designed for DC current measurement and high-speed applications (such as fast overcurrent protection), this amp has a high bandwidth of 1 MHz (at a gain of 20 V/V) and an 85 dB AC CMRR (at 50 kHz). It operates from a single 2.7 V to 20 V supply, drawing a 370 µA supply current (typical). The amp is available with five gain options including 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. Its low offset of the zero-drift architecture enables current-sensing with low ohmic shunts over the extended operating temperature range of -40°C to +125°C.

Simple Capacitive Touch Sensor Controller

Looking for a reliable capacitive touch sensor for your project? Look no further than Microchip's CAP1203. This calibrated multi-channel capacitive touch sensor controller is designed to compensate for system parasitic capacitance and automatically recalibrate to adapt to gradual environmental changes. Notably, it consumes very little power in deep sleep mode and can be used as a touch slider, working with materials up to 6mm thick including plastic, wood, and almost any other material.

PCB pad Design as below.

Check out the remade module by Sparkfun and give it a try!

Low cost temperature sensor

Low-cost temperature sensors can be achieved by using a diode or transistor (by shorting the Base and Collector). When constant current passes through the base-emitter junction it produces a voltage between the base and emitter (Vbe) that is a linear function of the absolute temperature. 

The overall forward voltage drop has a temperature coefficient of approximately 2 mV/°C. The semiconductor junction sensor’s voltage versus temperature is much more linear than that of a thermocouple or resistive temperature device (RTD).