Microcontroller-Based Charging Timer Proposal

flux

Yes — since this is a new design direction and you don’t have edit access to the current project, the right move is to start a new project with a pre-filled prompt, which matches the Flux project-URL workflow .
Create New Project: Randomized 12V Charging Timer
That link follows the required new-project creation URL format with a fully URL-encoded prompt .
If you want, I can also give you:
  • a version optimized for ATtiny85 only, or
  • a version optimized for ATmega328P only.
omvr

omvr

Set up the new project structure from the proposal in the screenshots, and keep it separate from this design. use the ATtiny85

flux

Here’s a separate new-project link set up specifically for the ATtiny85-based version of the proposal. Since you want this kept separate from the current AquaTimer design, the correct workflow is to create a new project with a fully URL-encoded prompt rather than modify this one
Create New Project: ATtiny85 Randomized 12V Charging Timer
That link uses the required Flux new-project URL format with a fully URL-encoded prompt, which is the recommended way to start a separate design when you don’t want to alter the current project
If you want, I can also prepare a second version of the prompt that is more specific about:
  • relay output current
  • vehicle-input protection
  • through-hole vs SMD parts
  • whether the timing should be field-configurable or fixed in firmware
Add input protection
Choose through-hole parts
Make timing configurable
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Documents

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    Assets

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    SVG.PNG

    SVGThumbnail

    Aquatimer

    Aquatimer thumbnail
    AquaTimer is a programmable timer for 12V devices such as lighting, solenoid valves or pumps not only for aquariums. It has three switchable channels for currents up to 2A each and up to 5A in total. Connected lighting can be dimmed if desired and slowly faded in and out to simulate sunrises and sunsets. The internal RTC of the ATtiny is used as a clockwork in conjunction with a 32.768kHz crystal. A backup battery keeps the clock running even if the external power supply is interrupted. Settings are made using three buttons and the OLED display.

    Properties

    Properties describe core aspects of the project.

    Pricing & Availability

    Distributor

    Qty 1

    Digi-Key

    $5.83–$11.52

    LCSC

    $11.79–$12.17

    Mouser

    $9.98

    Controls