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Arduino Hardware Reset Circuit PCB

Featured User: kurt

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Updates 2013 February 18

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Arduino Hardware Reset Circuit PCB

7bece8c1efa36b50bbfe804f08cc477cf6653652

By: kurt

This circuit uses one pin to let you reset your Arduino in code. It pulls reset high for a couple milliseconds to ensure the Arduino has enough time to complete its reset cycle. This circuit is similar to Arduino Hardware Reset Circuit Breadboard, but it uses a PCB and requires soldering skills to assemble.

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Files

Arduino_Reset.pde - Arduino Reset Sketch
ArduinoReset.sch - Arduino Reset EAGLE Schematic
ArduinoReset.brd - Arduino Reset EAGLE Board
Arduino Reset V1.zip - Arduino Reset GERBER

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Bill of Materials

Qty	Part #	Description	Schematic ID	Source
1	NE555P	TIMER SINGLE PRECISION,DIP8 ,0.5MHZ	IC1	Source
2	CF14JT10K0	1/4w 10K ohms 5% Carbon Film Resistors	R1, R2	Source
1	CF14JT1K00	1/4w 1K ohms 5% Carbon Film Resistors	R3	Source
1	CF14JT100R	1/4w 100 ohms 5% Carbon Film Resistors	R4	Source
1	2N3904BU	TRANSISTOR, NPN 200MA TO-92	Q1	Source
1	SK4R7M050ST	CAPACITOR ALUM ELECT 4.7UF, 50V, RADIAL	C1	Source
1	SR215C103KAR	CAPACITOR, 0.01UF, 50V	C2	Source
1	TSW-150-07-T-S	CONN HEADER 50POS .100" SNGL TIN		Source
1	SSA-132-S-T	CONN RCPT .100" 32POS TIN PCB		Source

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Steps

6. Solder 4.7uF Capacitor

Solder the 4.7uF cappacitor in the slot labeled 0.1uF. Make sure the stripe on the side of the capacitor is near the board edge.

7. Solder the Female Headers

Be careful when breaking the female headers apart. It is easy to break them in the wrong position if you are not careful. I used a pair of needle-nose pliers to break the headers apart.

8. Solder the Male Headers

The male headers point down so they can be inserted into the female headers on the Arduino.

9. Use it!

Plug the Arduino Reset Board into your Arduino. To test to make sure it works, upload the Arduino_Reset_Sketch to your Arduino. The LED on board the Arduino should turn on for 5 seconds, then turn off for one second, and repeat this cycle if the board is working correctly. Watch the video in the description at the top of this page to see what this looks like on my Arduino.

Special note: In custom applications, make sure that the first three lines of code in setup() your Arduino sketch are as follows:
digitalWrite(A0, LOW);
pinMode(A0, OUTPUT);
digitalWrite(A0, LOW);

Failure to do so may result in your Arduino getting stuck in a reset loop.

Featured User: kurt

Updates 2013 February 18