wiki:SpringleafUSBControl

This page describes a USB battery discharge controller for Springleaf.

Project Description

(from Greg Ekchian at Springleaf)

I would like to quote a project for making a printed circuit board and containing box with the following criteria.

Further Details

He would like two assembled boxes and one spare assembled PC board. He has a USB-6210 we can borrow.

He would like us to order both sizes of box proposed below and we should use the smaller size if the USB-6210 fits.

An additional connector should be provided for an alternative application where no relay is required, i.e. a connector across the relay contacts.

Parts Chosen

  • USB-6210 from National Instruments –  Web Page •  Photos
  • Preferred box: Hammond 1590EBK
  • Alternate box: Hammond 1590EEBK
  • Banana jack black: Pomona 1581-0
  • Banana jack red: Pomona 1581-2
  • Banana jack yellow: Pomona 1581-4
  • Relay: Coto 9007-05-40 (DigiKey? 306-1251-ND)

The USB-6210 is to be mounted inside the box with an opening cut to allow entry of the USB cable. One digital output from the USB-6210 drives the coil of the relay. The N.O. relay contacts are connected in series with the battery and 60 ohm resistor.

Proposed layout is an ExpressPCB mini-board mounted below the lid of the box on short spacers. The banana plugs would be mounted in the PCB, projecting through the lid. The relay, resistor and a two-pin connector for the USB-6210 are mounted on the bottom of the board.

Design Files