OHMC2020 Hardware instructions - Revision history

Geekscape: /* Parts Required */

2020-01-14T00:44:59Z

Parts Required

← Older revision		Revision as of 00:44, 14 January 2020
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	For reference, this is a complete kit with all the parts spread out. It looks like a lot, but we'll be tackling it in easy stages:		For reference, this is a complete kit with all the parts spread out. It looks like a lot, but we'll be tackling it in easy stages:

	IMPORTANT NOTE FOR OHMC2020: UNFORTUNATELY THE BUTTONS AND CABLE TIES ARE NOT INCLUDED		'''IMPORTANT NOTE FOR OHMC2020: UNFORTUNATELY THE BUTTONS AND CABLE TIES ARE NOT INCLUDED'''

	[[File:2020-dc-1-all-parts.jpg\|600px]]		[[File:2020-dc-1-all-parts.jpg\|600px]]

Geekscape: /* Parts Required */

2020-01-14T00:44:44Z

Parts Required

← Older revision		Revision as of 00:44, 14 January 2020
Line 17:		Line 17:

	For reference, this is a complete kit with all the parts spread out. It looks like a lot, but we'll be tackling it in easy stages:		For reference, this is a complete kit with all the parts spread out. It looks like a lot, but we'll be tackling it in easy stages:

			IMPORTANT NOTE FOR OHMC2020: UNFORTUNATELY THE BUTTONS AND CABLE TIES ARE NOT INCLUDED

	[[File:2020-dc-1-all-parts.jpg\|600px]]		[[File:2020-dc-1-all-parts.jpg\|600px]]
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	* 4 x M3 nuts		* 4 x M3 nuts
	* 2 x M3 washers		* 2 x M3 washers
	* 2 x 4.5x4.5x7mm tact switches		* 2 x 4.5x4.5x7mm tact switches (NOT INCLUDED)
	* 12 x 6mm countersunk M3 bolts		* 12 x 6mm countersunk M3 bolts
	* 2 x laser-cut camera mounts (straight slot)		* 2 x laser-cut camera mounts (straight slot)

Geekscape: OHMC2020 didn't include the Step 1 buttons :(

2020-01-14T00:24:34Z

OHMC2020 didn't include the Step 1 buttons :(

← Older revision		Revision as of 00:24, 14 January 2020
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	=== Step 1: Buttons ===		=== Step 1: Buttons ===

			'''IMPORTANT NOTE FOR OHMC2020: UNFORTUNATELY THE BUTTONS ARE NOT INCLUDED, PLEASE SKIP TO STEP 2'''

	The kit includes 2 small buttons. These are commonly referred to as "tactile switches", or abbreviated to "tact switches".		The kit includes 2 small buttons. These are commonly referred to as "tactile switches", or abbreviated to "tact switches".

Jonathan Oxer: /* Mount Perception Module On Chassis */

2020-01-11T09:39:09Z

Mount Perception Module On Chassis

← Older revision		Revision as of 09:39, 11 January 2020
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	[[File:2020-dc-40-mounted.jpg\|600px]]		[[File:2020-dc-40-mounted.jpg\|600px]]

	~~Attach~~ the ~~steering servo~~ and the ~~motor~~ speed controller to the ~~Dingo Cap~~.		The PWM output channels on the black/red/yellow connectors are numbered from 0 to 7, starting at the bottom and going up.

			Channel 0 (the bottom row of pins) is for the ESC, or electronic speed controller.

			Channel 1 (the second row of pins) is for the steering servo.

			Trace back along the wires to find out which is which. Usually the steering servo cable is the longer one.

	The small black connector for the steering servo may have a ridge down one edge that stops it being connected to the Dingo Cap, because it blocks against the acrylic case. Use a pair of side-cutters to trim it off.		The small black connector for the steering servo may have a ridge down one edge that stops it being connected to the Dingo Cap, because it blocks against the acrylic case. Use a pair of side-cutters to trim it off.

			Black is GND, red is 5V, and yellow is signal. Orient the servo connectors so the black (GND) wire goes to the black pin on the Perception Module.

			[[File:2020-dc-41-pwm.jpg\|600px]]

	== SD Card and Pre-Flight Check ==		== SD Card and Pre-Flight Check ==

Jonathan Oxer: /* SD Card and Pre-Flight Check */

2020-01-11T09:15:22Z

SD Card and Pre-Flight Check

← Older revision		Revision as of 09:15, 11 January 2020
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	== SD Card and Pre-Flight Check ==		== SD Card and Pre-Flight Check ==

	Insert the SD card into the Raspberry Pi. The socket is ~~hidden underneath~~ the ~~Pi, just near~~ the ~~handy indentation in the base plate. Amazing coincidence. Insert the card with the contacts up:~~		Insert the SD card into the Raspberry Pi. The socket is on the front of the Perception Module.

	~~[[File:dc-250-sd-card~~.~~jpg\|600px]]~~

	All the hardware is now complete. The battery should still be disconnected.		All the hardware is now complete. The battery should still be disconnected.

	On the top of the chassis (under the base plate) is a small power switch. They're in different places on different cars, but mostly they are near the middle ~~and located under the hole near the camera mount~~. It has small writing on it saying On and Off. Put it in the Off position.		On the top of the chassis (under the base plate) is a small power switch. They're in different places on different cars, but mostly they are near the middle. It has small writing on it saying On and Off. Put it in the Off position.

	~~Your Donkey Car is now ready to be started~~.

	~~[[File:dc-270-complete~~.~~jpg\|600px]]~~		Your Dingo Car is now ready to be started.

	'''WARNING: There is no power control for the Raspberry Pi. The power switch controls the chassis (the steering servo and speed controller) but doesn't control the Pi. To control power to the Pi, you must connect and disconnect the battery. Don't leave the battery connected and leave the car, because the Pi will drain the battery all the way to dead flat if you're not paying attention.'''		'''WARNING: There is no power control for the Raspberry Pi. The power switch controls the chassis (the steering servo and speed controller) but doesn't control the Pi. To control power to the Pi, you must connect and disconnect the battery. Don't leave the battery connected and leave the car, because the Pi will drain the battery all the way to dead flat if you're not paying attention.'''

Jonathan Oxer: /* Attach Steering, Speed Control, and Power */

2020-01-11T09:05:25Z

Attach Steering, Speed Control, and Power

@@ Line 259: / Line 259: @@
 [[File:2020-dc-40-mounted.jpg|600px]]
-== Attach Steering, Speed Control, and Power ==
+Attach the steering servo and the motor speed controller to the Dingo Cap.
-Feed the pair of servo cables up through the hole in the base plate. The shorter cable is the throttle. The longer cable is steering.
+The small black connector for the steering servo may have a ridge down one edge that stops it being connected to the Dingo Cap, because it blocks against the acrylic case. Use a pair of side-cutters to trim it off.
 == SD Card and Pre-Flight Check ==

Jonathan Oxer: /* Mount Camera And Hat */

2020-01-11T09:00:48Z

Mount Camera And Hat

← Older revision		Revision as of 09:00, 11 January 2020
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	[[File:2020-dc-40-mounted.jpg\|600px]]		[[File:2020-dc-40-mounted.jpg\|600px]]

	~~== Mount Camera And Hat ==~~

	~~Be VERY careful with this part. If you insert the camera ribbon cable backwards, it can destroy both the camera and the Raspberry Pi. It's also very easy to physically break the connector.~~

	~~Start by threading the camera cable though the slot in the hat, so that it's oriented as shown below. The blue part of the cable is on the other side, and the metal fingers are on the close side:~~

	~~[[File:dc-180-camera.jpg\|600px]]~~

	~~The socket for the flex cable has a small black clip that rises up about 2mm from the connector. Very carefully raise it by prising it up from the ends. Don't break it off!~~

	Then slide the flex cable into the connector. Check again that the blue side of the cable is against the black clip, as shown here. Then use your fingernail or a small screwdriver to gently click the black clip straight down into the connector. When it clicks down it will grip the flex cable and hold it tightly in place:

	~~[[File:dc-190-camera.jpg\|600px]]~~

	~~When you are confident that the camera cable is inserted correctly, slide the Donkey Car Hat down onto the Raspberry Pi header. It should sit neatly on the rubber stopper:~~

	~~[[File:dc-200-camera.jpg\|600px]]~~

	~~Feed the camera through the vertical slot in the camera mount, towards the front of the car. Bend it up and use the supplied double-sided tape to attach it to the top of the camera mount:~~

	~~[[File:dc-210-camera.jpg\|600px]]~~

	== Attach Steering, Speed Control, and Power ==		== Attach Steering, Speed Control, and Power ==

Jonathan Oxer: /* Mount Perception Module On Chassis */

2020-01-11T09:00:16Z

Mount Perception Module On Chassis

← Older revision		Revision as of 09:00, 11 January 2020
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	Place the Perception Module on top of the acrylic base plate, and push the Lego pieces down into the base plate:		Place the Perception Module on top of the acrylic base plate, and push the Lego pieces down into the base plate:

	[[File:2020-dc-40-~~mounting~~.jpg\|600px]]		[[File:2020-dc-40-mounted.jpg\|600px]]

	== Mount Camera And Hat ==		== Mount Camera And Hat ==

Jonathan Oxer: /* Prepare Raspberry Pi */

2020-01-11T08:59:26Z

Prepare Raspberry Pi

← Older revision		Revision as of 08:59, 11 January 2020
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	[[File:2020-dc-33-camera.jpg\|600px]]		[[File:2020-dc-33-camera.jpg\|600px]]

	~~== Prepare Raspberry Pi ==~~

	~~Fit the~~

	== Chassis Preparation ==		== Chassis Preparation ==

Jonathan Oxer: /* Final mechanical integration */

2020-01-11T08:59:10Z

Final mechanical integration

← Older revision		Revision as of 08:59, 11 January 2020
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	[[File:2020-dc-33-camera.jpg\|600px]]		[[File:2020-dc-33-camera.jpg\|600px]]

	~~== Final mechanical integration ==~~


	== Prepare Raspberry Pi ==		== Prepare Raspberry Pi ==