PiPower - Revision history

Rew: /* Protocol */

2012-07-17T12:55:31Z

Protocol

Rew: /* X3 */

2012-07-17T12:43:53Z

Rew: /* X2 */

2012-07-17T12:43:45Z

Rew: /* X2 */

2012-07-17T12:43:32Z

Rew: /* X1 */

2012-07-17T12:42:54Z

Rew: /* Use cases */

2012-07-17T10:10:15Z

Use cases

Tom: Created page with "The PiPower board (depicted: the SPI version) This is the documentation page for the SPI_PiPower and I2C_PiPower bo..."

2012-07-11T12:53:22Z

Created page with "thumb|300px|alt=The PiPower board|The PiPower board (depicted: the SPI version) This is the documentation page for the SPI_PiPower and I2C_PiPower bo..."

New page

[[File:SPI_PiPower.jpg|thumb|300px|alt=The PiPower board|The PiPower board (depicted: the SPI version)]]

This is the documentation page for the SPI_PiPower and I2C_PiPower boards.

== Overview ==

This board enables you to switch upto 4 separete 12V 1A loads, and switch the 5V power rail to the GPIO header of the Paspberry Pi.

== Use cases ==

=== Pipower powered from USB, powers RPi on command ===

Jumper settings: 
JP1: 2-3 
JP2: nc 

=== Pipower powered from RPi. Switches 12V appliances on command ===

Jumper settings: 
JP1: 1-2 
JP2: nc 

=== Pipower powered from 12V on screw connector. Switches a 12V load on command (DCDC converter powering PI) ===

Jumper settings: 
JP1: 2-3 
JP2: 1-2 

=== Pipower powered from 5V on screw connector ===

Jumper settings: 
JP1: 2-3 
JP2: 2-3 

== Assembly instructions ==

None: the board comes fully assembled.

== External resources ==

=== Datasheets ===

* [http://www.irf.com/product-info/datasheets/data/irlml9301pbf.pdf The P-FETs]

== Additional software ==

=== Related projects ===

== Pinout ==

For the SPI connector see: [[SPI_connector_pinout]]. 
For the I2C connector see: [[I2C_connector_pinout]].

=== X1 ===

{| border=1
! pin !! function
|-
| 1 || Vin
|-
| 2 || GND
|}

=== X2 ===

{| border=1
! pin !! function
|-
| 1 || Anode
|-
| 2 || Cathode
|}

=== X3 ===

{| border=1
! pin !! function
|-
| 1 || Anode
|-
| 2 || Cathode
|}

=== X4 ===

{| border=1
! pin !! function
|-
| 1 || Vin1
|-
| 2 || GND
|-
| 3 || Out0
|-
| 4 || GND
|-
| 5 || Out1
|-
| 6 || GND
|}

=== X5 ===

{| border=1
! pin !! function
|-
| 1 || Vin2
|-
| 2 || GND
|-
| 3 || Out2
|-
| 4 || GND
|-
| 5 || Out3
|-
| 6 || GND
|}

=== LEDs ===

The only LED is a power indicator.

== jumper settings ==

=== Solder Jumper ===

See [[solder jumpers]] on how to change the solder jumper.

By changing the solder jumper SJ1, you can make the connector SPI1 into an ICSP programming connector for the attiny44 on the board.

=== Hardware Jumpers ===

JP1: Power source selection 
1-2: RPi powered 
2-3: USB or X1 powered 

JP2: Vin selection 
1-2: X1 powered, Vin = 5V 
2-3: X1 powered, Vin > 5V 
N-C: USB or RPi powered 

== Protocol ==

For the intro to the SPI and I2C protocols read: [[SPI versus I2C protocols]]

The board specific protocol can be found here: [[PiPower_protocol]]

You should also read the [[General_SPI_protocol]] notes.
 
For arduino, a sample PDE is available, called ardemo_lcd.pde, also at [http://www.bitwizard.nl/software|the BitWizard software download directory] . 
 
This is a demo to send things using SPI to the lcd board. The SPI routines there are applicable for the PiPower board as well. 

== The software ==

== Default operation ==

== Future hardware enhancements ==

== Future software enhancements ==

== Changelog ==

=== 1.0 ===

* Initial public release

@@ Line 168: / Line 168: @@
 You should also read the [[General_SPI_protocol]] notes.
 <br>
-For arduino, a sample PDE is available, called ardemo_lcd.pde, also at [http://www.bitwizard.nl/software|the BitWizard software download directory] .<br>
+For arduino, a sample PDE is available, called ardemo_lcd.pde, also at [http://www.bitwizard.nl/software the BitWizard software download directory] .<br>
 <br>
 This is a demo to send things using SPI to the lcd board. The SPI routines there are applicable for the PiPower board as well.<br>

@@ Line 8: / Line 8: @@
 == Use cases ==
+Electrically the PiPower has a few modes-of-operation.
 === Pipower powered from USB, powers RPi on command ===
@@ Line 15: / Line 17: @@
 JP2: nc<br>
+In this configuration you can use your normal USB power supply, and when a time elapses power the 'pi up. Or you can have the pi power up when a signal on the inputs changes.
-=== Pipower powered from RPi. Switches 12V appliances on command ===
+This is also the easiest way to provide the watchdog function.
+=== Pipower powered from RPi. Switches 5-15V appliances on command ===
 Jumper settings:<br>
@@ Line 21: / Line 27: @@
 JP2: nc<br>
+This is not the original purpose of the PiPower, but a nice extra. The PiPower can switch 1A loads.
-=== Pipower powered from 12V on screw connector. Switches a 12V load on command (DCDC converter powering PI) ===
+=== Pipower powered from 7-15V on screw connector. Switches a load on command (usually DCDC converter powering PI) ===
 Jumper settings:<br>
 JP1: 2-3<br>
 JP2: 1-2<br>
+This is the configuration best suited for battery power. The PiPower keeps time, and monitors up to two inputs and switches the 'pi on to handle things when either time runs out or one of the inputs becomes active. This way the PiPower can power up your 'Pi for short periods to do "complicated" stuff, while it conserves power for the long times of inactivity.
 === Pipower powered from 5V on screw connector ===
@@ Line 32: / Line 42: @@
 JP1: 2-3<br>
 JP2: 2-3<br>
+This is similar to the first item, but now you can use your own DCDC converter. The simplest DCDC converters still use a bit of "idle power", so it might not be as good as the "PiPower directly from the battery" case and having the PiPower turn on the power to the DCDC converter.
+On the other hand, if you have a DCDC converter that is efficient at low loads and/or you need the DCDC converter to run anyway because of the other "input signals", then this mode is provided.
 == Assembly instructions ==

@@ Line 92: / Line 92: @@
 === X3 ===
+Opto isolated input 1. Max 20V.
 {| border=1
 ! pin !! function

@@ Line 82: / Line 82: @@
 === X2 ===
-Opto isolated input. Max 20V.
+Opto isolated input 0. Max 20V.
 {| border=1
 ! pin !! function

@@ Line 71: / Line 71: @@
 === X1 ===
+Power input. Usually 12V. Do not apply 12V when jumpered for 5V on this connector as it will fry your PiPower.
 {| border=1
 ! pin !! function