| | 1 | This page describes a USB battery discharge controller for Springleaf. |
| | 2 | |
| | 3 | == Project Description == |
| | 4 | |
| | 5 | (from Greg Ekchian at Springleaf) |
| | 6 | |
| | 7 | I would like to quote a project for making a printed circuit board and containing box with the following criteria. |
| | 8 | |
| | 9 | |
| | 10 | |
| | 11 | |
| | 12 | |
| | 13 | |
| | 14 | == Further Details == |
| | 15 | |
| | 16 | He would like two assembled boxes and one spare assembled PC board. |
| | 17 | He has a USB-6210 we can borrow. |
| | 18 | |
| | 19 | He would like us to order both sizes of box proposed below and we should use the smaller size |
| | 20 | if the USB-6210 fits. |
| | 21 | |
| | 22 | An additional connector should be provided for an alternative application where |
| | 23 | no relay is required, i.e. a connector across the relay contacts. |
| | 24 | |
| | 25 | |
| | 26 | == Parts Chosen == |
| | 27 | |
| | 28 | * USB-6210 from National Instruments – [http://sine.ni.com/nips/cds/view/p/lang/en/nid/203223 Web Page] • [http://ohm.bu.edu/~hazen/Springleaf/USB_Box/ Photos] |
| | 29 | * Preferred box: Hammond 1590EBK |
| | 30 | * Alternate box: Hammond 1590EEBK |
| | 31 | * Banana jack black: Pomona 1581-0 |
| | 32 | * Banana jack red: Pomona 1581-2 |
| | 33 | * Banana jack yellow: Pomona 1581-4 |
| | 34 | * Relay: Coto 9007-05-40 (DigiKey 306-1251-ND) |
| | 35 | |
| | 36 | The USB-6210 is to be mounted inside the box with an opening cut to allow entry of the USB cable. |
| | 37 | One digital output from the USB-6210 drives the coil of the relay. The N.O. relay contacts |
| | 38 | are connected in series with the battery and 60 ohm resistor. |
| | 39 | |
| | 40 | Proposed layout is an ExpressPCB mini-board mounted below the lid of the box on short spacers. |
| | 41 | The banana plugs would be mounted in the PCB, projecting through the lid. |
| | 42 | The relay, resistor and a two-pin connector for the USB-6210 are mounted on the bottom of the board. |
| | 43 | |
| | 44 | == Design Files == |
| | 45 | * [http://ohm.bu.edu/~hazen/Springleaf/USB_Box/files/Automated%20Rdc%20System%20Box.PDF Front Panel Drawing] |
| | 46 | * Schematic [http://edf.bu.edu/~cjlawlor/SpringLeaf/USBControl/USBControl.sch USBControl.sch] • [http://ohm.bu.edu/~cjlawlor/SpringLeaf/USBControl/USBControl_sch.pdf PDF] |
| | 47 | * Layout [http://edf.bu.edu/~cjlawlor/SpringLeaf/USBControl/USBControl.pcb USBControl.pcb] • [http://ohm.bu.edu/~hazen/Springleaf/USB_Box/files/USBControl_pcb.pdf PDF] |
| | 48 | * Mechanical Drawing [http://edf.bu.edu/~cjlawlor/SpringLeaf/USBControl/USBControl.dxf USBControl.dxf] |
| | 49 | |
