JuiceBox documentation!

Introduction to JuiceBox

JuiceBox project aims on a device that takes credentials and authenticate against granted rights. Operator and Staff tokens are scanned and if they are correct then only they are given authorization to use the machinery otherwise the JuiceBox blinks multiple times.

Goals:

A device to intake user credentials, authenticate against granted rights, and enable/disable usage based on those.
Utilize RFID as a medium for user credentials.
Control usage of the machines via controlling power to it.

Usage:

Place a user’s RFID tag in front of the scanner.
Press the button to scan tag, light will indicate scan status
- If the scan was succesful, the LED will blink once.
- If NOT – The LED will blink multiple times and the sequence will reset.
Place a staff member’s RFID tag in front of the scanner and press the button
If permissions are correct, JuiceBox will blink the LED once and then leave it on.
If permissions are incorrect, JuiceBox will blink the LED multiple times and the sequence will reset

Building a JuiceBox:

The MFRC22 reader we currently employ works via SPI interface. Use the following pinout scheme to connect the RFID, button switch, status LED and relay :

Device	Name	Pin #	Pin Name
MFRC22	SDA	24	GPIO 8
	SCK	23	GPIO 11
	MOSI	19	GPIO 10
	MISO	21	GPIO 9
	IRQ	None	None
	GND	GND	Ground
	RST	22	GPIO 25
	3.3V	1	3v3
Button	COM	40	GPIO 21
	NO	GND	Ground
LED	+	33	GPIO 13
	-	GND	Ground
Relay	+	3	GPIO 2
	-	GND	Ground

Connect the Button switch poles to GPIO 40 and Ground

Connect the LED to GPIO 10 and Ground

Connect the Relay to GPIO 3 and Ground

Workflow:

Design Drawing

schematic diagram

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Schematic
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PCB

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PCB_JuiceBox_RPI_Sheild
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	2.54-2*20	H1	HDR-TH_40P-P2.54-V-F-R2-C20-S2.54	1	2.54-2*20
2	1x4	H2	HDR-TH_4P-P2.54-V-M	1	PZ254V-11-04P_C2691448
3	SS12D00G	K1	SS12D00G3	1	SWITCH_3PIN_MICRO
4	XH-8A	RC522	CONN-TH_8P-P2.50_XH-8A	1	XH-8A
5	XH-2A	RELAY	CONN-TH_XH-2A	1	XH-2A_C2910525
6	XH-4A	SWITCH	CONN-TH_XH2.50-4P	1	XH-4A_C2908602