This thermometer and hygrometer project from Kerry Wong’s website illustrates a technique of constructing analog display panels where the display needles are controlled through servo motors. The project uses the SHT21 digital sensor and the ATMega328p microcontroller.
Thermometer and Hygrometer with analog display panels
MikroElektronika, a Belgrade, Serbia-based company is well-known for producing quality software and hardware development tools for a wide range of microcontroller families, including PIC, AVR, and ARM processors. Their mikroC Pro for PIC has always been my favorite PIC compiler, and has been extensively used in my PIC tutorials and projects published on this website, for its ease of use and rich set of built-in library routines. Today, I am reviewing MikroElektronika’s EasyPIC v7, which is the latest PIC development board in their line of EasyPIC series. I would like to thank to Newark USA for providing the EasyPIC v7 board for completing this review.
EasyPIC v7 development board
The Serial Monitor application embedded into the Arduino IDE is a very useful tool in developing Arduino applications. In addition to its normal use for sending/receiving data bytes over the Arduino serial link, the Serial Monitor tool is extensively used for diagnostic or debugging purpose by serially printing out the intermediate values of the program variables during various steps of execution. The drawback of this debugging approach is you need access to computer for using the Arduino Serial Monitor or any other serial terminal program. ARPix has posted this instructable on constructing an external serial monitor device using the Atmega328 MCU and a graphic LCD. It allows a user interface to set the serial baud rate and start/stop functions using tact switches.
External serial monitor for testing/debugging
This low power wireless gas meter monitor built at a budget of about 35EUR is battery-powered and uses a JeeNode MCU board along with an nRF24L01+ transmitter to send the gas consumption info to a remote Raspberry Pi.
JeeNode MCU board
This instructable describes a mini line follower robot that requires no microcontroller unit for control. The line sensing and steering mechanism is constructed totally using analog circuitry consisting of two OpAmps. The robot is powered by a rechargeable Lithium-ion battery.
Mini line follower robot