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This Arduino Nano controlled solar battery charger can charge a standard lead acid 12V battery and runs with 90% efficiency under 70ᵒC (158ᵒF). The circuit can take up to 24V input from the solar panels. The maximum power point tracking is implemented in the circuit by measuring the output voltage and current from the solar panel to get the maximum possible power from it.
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Here is another countdown timer based on the PIC16F886 microcontroller. The timer displays the time on four bright 7-segment LEDs, which are driven by a TLC5916 LED driver chip. The timer flashes the seven segment LEDs when the time is up. The timer settings are done with a rotary encoder with a push button, and gets powered from two AAA batteries.
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Brett’s new masterclock is Arduino-controlled and keeps very accurate time by periodically synchronizing with the DCF77 “Atomic” Clock in Mainflingen near Frankfurt, Germany. The DCF77 library for Arduino is used to decode the time signal broadcasted from the atomic clock. The time is displayed as hours, minutes, and seconds on six 1″ seven segment LEDs. A 4×20 I2C LCD display is also used in the project to display additional info such as display brightness, sync information, signal quality, auto tune’d frequency, auto tuned quartz accuracy, etc. Both the displays are auto-dimmed based on the surrounding light intensity using an LDR sensor
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This Arduino-based Pill Reminder is suitable for people who often forget to take their medicines on time. It has 14 pill compartments in total and each compartment contains pills for a day of week. An RTC chip is used for timekeeping, and LEDs are used to light up the appropriate compartment every day. In addition, a proximity sensor is also implemented to sense a person approaching the device, which in turn, makes the LED blink to attract the attention.
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HLK-RM04 is a low-cost UART-ETH-WIFI module developed by Shenzhen Hi-Link Electronic co., Ltd with built-in TCP / IP protocol stack. In this article, Ray shares his first experience experimenting with this module and explores its Serial-to-WiFi capability using Arduino.
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