PID989 - Pi Down Delay

Product Diagram

The Pi Down is designed for use with the Raspberry Pi4, the one board computer when powered from a battery supply.

As many of these systems are a battery, solar panel combination the 5V supply for the Raspberry Pi has not fully catered for.

The Pi can collect large amounts of data collected to sent to remote systems. The Pi is very reliable as long at the 5V supply remains stable during write operations to its storage.

If the 5V supply fails during a write cycle corruption in the data storage will occur and mat require rebuild of the operating system. The Pi Down provides a regulated 5V from a 12 to 24V battery supply.

The open collector output is wired to the Pi4. The transistor is off (3.3V) during normal operation and the internal lithium ion polymer batteries are charged or floated. When the input supply fails or the voltage is too low the open collector is switched on (0.4V) signalling the Pi4 to shutdown. The regulated 5V output remains at 5V for 15 seconds before it is switched off.



Power Supplynone



Most drawings are supplied in PDF format. Portable Document Format is used to present documents in a manner independent of application software, hardware, and operating systems.


Lead Time for a Preferred Accessory Product


Accessory items are not manufactured by APCS. Accessory items only have 1 year warranty and may not be returned for credit. Accessory have a different discount structure to APCS manufactured items by APCS. Delivery is typically 12 days.

Alternate Products




Order Processing


APCS makes and customises products according to a customers order. Upon receipt of the customers order the following information is required before manufacture, allocation or deliver until full details are given, these include;

  1. Identity of purchaser. Company name, ABN (Australian companies), street address and accounts email address.
  2. Required delivery address.
  3. Full part number and calibration detail required to manufacture items.
  4. Total on purchase order to include delivery charges. Orders received with missing information will be entered and marked to indicate missing details and returned to the customer for correction or approval.

Compliance with the above ensures that your items are manufactured and delivered according to the required specifications.

Standard delivery times commence after the order has been approved for processing.