For a home project (my wife's actually), the need arose to control the operating time of a simple mini ice cream maker, with programmable times depending on the type of ice cream you wanted to make.

So I designed this module (which would not only be useful for this, but for anything imaginable). The brain of the module is an ATtiny85, and it comprises 3 buttons to be programmed to do whatever you want (for example, increase and decrease the time, and start/stop the process). It also has a couple of connections for LEDs.

Materials

• ATtiny85-20P
• 12mm diameter THT active buzzer
• 2-pin terminal connector with screw KF301-2 (x2)
• 1N4007 SMD D_SMA diode
• LED diode (x2)
• 128x64 SSD1306 I2C OLED display
• 3x2 PinHeader for ICSP
• 5x5mm SMD push button, 4 legs (x3)
• SRD-05VDC-SL-C relay
• 1K 1206 SMD resistor (x2)
• 22K 1206 SMD resistor
• 33K 1206 SMD resistor
• 90.6K 1206 SMD resistor
• J3Y SMD transistor

Features

• Simple and easy to assemble
• Useful for controlling an electrical device or appliance (AC or DC) by time
• 5V DC power supply
• Increases/decreases the on time
• Easy to program the ATtiny "In-Situ", thanks to the built-in ICSP connector
• It has three holes for mounting (if desired), whose measurements are for metric 3 bolts (M3)
• 63x34mm PCB

PCBWay Service

Both the circuit and PCB schematics were designed in KiCAD v8. The Gerber was then generated so that it could be sent to PCBWay for manufacturing (like all my boards that I have made). On this occasion, a green PCB with white silkscreen printing was chosen (the classic).

We received the PCBs in just 10 days (to Chile), and as always, the quality was exceptional.

It should be mentioned that during these ten years, PCBWay has distinguished itself by providing exceptional PCB manufacturing and assembly services, becoming a trusted partner for countless engineers and designers around the world.

Its commitment to quality and customer satisfaction has been unwavering, leading to significant growth and expansion.

My advice: check out PCBWay here if you want excellent PCB service at an affordable price, you won't regret it.