Using an Arduino/CNC shield setup for ham radio control
— March 16th, 2020
Loop antennas for ham radios use heavy duty variable capacitors for tuning. Since such capacitors need to be physically turned for adjustment, radio enthusiast Jose B.O. made his own remote rig using an Arduino Uno and CNC shield.
The CNC setup allows stepper motors to rotate through a range of angles for frequency selection, and three antennas can be controlled via separate Pololu A4988 driver modules. An optical encoder is used for control, along with buttons for preset frequencies, and a 16×2 I2C LCD display provides visual feedback. Microswitches are implemented to set the upper and lower bounds for the stepper motors.
More info is available in the project’s write-up and the videos below show the system in action.
March 18th, 2020 at 11:23:10
A donation is a gift for charity, humanitarian aid, or to benefit a cause. A donation may take various forms, including money, alms, services, or goods such as clothing, toys, food, or vehicles. A donation may satisfy medical needs such as blood or organs for transplant.
Donating to NGOs comes with a great reward. The amount you donate gets deducted from your taxable income and you are thus, not liable to pay any income tax to it. While this shouldn’t be the key reason for donating for a cause, it is surely a great bonus. And you achieve two good things with one act.One more things is that you have help the people who needs money or other things indirectly.Many of the poor people or children gives you bless.