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This article may help you https://www.engineersgarage.com/articles/spi-what-serial-peripheral-interface-protocol
please ask is any doubt ……
SPI is short distance communication technology if you want more detail please visit here https://www.engineersgarage.com/articles/spi-what-serial-peripheral-interface-protocol
It is called RFID that is a card which can recognized by it's RFID detector ,each card has specific code and the time can be determine by RTC that give you real time of your clock.
please visit the link, here you will get how to take analog input https://www.engineersgarage.com/embedded/arduino/how-use-analog-input-and-analog-output-arduino-board
Now, you can get analog input from load cell after this jus put 1KG load to calibreate it for example if you getting 376 analog value at 1KG just divide the analog value with 376 to get exact value of load.March 23, 2019 at 1:14 pm in reply to: frequency counter using 8051(with the help of external interrups: #15058
Please visit link , there is project that mesure or count frequency https://www.engineersgarage.com/contribution/frequency-and-rpm-counter
yes, you can get signal inside of house
you can get help from this peoject https://www.engineersgarage.com/contribution/dot-matrix-display-using-arduino
Any IC that generate PWM upto 12v may be work for fast switching .
Please, Ask Question clearly and as i understand if you want to high voltage output at the logic high of MCU then you can connect Relay that opearate as a switch and Make Switch close to connected with power supply .
you can get help from this project https://www.engineersgarage.com/contribution/gps-and-gsm-based-vehicle-tracking-system
you can buy online or if you want to make it DIY then take a exhaust fan and mount it on stand above your soldering desk
you can buy online or if you want to make it DIY then take a exhaust fan and mount it on stand above your soldering deskMarch 5, 2019 at 4:28 am in reply to: LCD 12C 16X2 LCM1602 IIC V1 Interface problems with arduino #15047
You can get help from this project https://www.engineersgarage.com/contribution/increasing-range-rf-module-using-antennaMarch 5, 2019 at 4:17 am in reply to: Accurate and Precise Negative Adjustable Voltage Range #15045
Let's consider AC negative voltage range is the change of polarity So change the terminal of DC voltage that become negative voltage. if you want to do this microcontroller then use L293D to switch polarity .