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Servo Trigger (Open hardware)

4 years ago 764
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  • Documents
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Description

Description: The SparkFun Servo Trigger is a small robotics board that simplifies the control of hobby RC servo motors. When an external switch or logic signal changes state, the Servo Trigger is able to tell an attached servo motor to move from position A to position B. To use the Servo Trigger, you simply connect a hobby servo and a switch, then use the on-board potentiometers to adjust the start/stop positions and the transition time. You can use a hobby servos in your projects without having to do any programming!

The heart of the Servo Trigger is an Atmel ATTiny84 microcontroller, running a small program that implements the servo control features we are discussing here. On-board each Servo Trigger you will find three potentiometers, “A” sets the position the servo sits in while the switch is open, “B” sets the position the servo moves to when the switch is closed, and “T” sets the time it takes to get from A to B and back. Compared to a servo motor, the Servo Trigger board draws very little current, roughly 5 mA at 5V. Be sure to note that if you’re using the Servo Trigger to control your motor, the absolute maximum supply voltage that should be applied is 5.5 VDC. Additionally, the SparkFun Servo Trigger is designed to make it easy to daisy chain boards – you can simply connect the VCC and GND pads on adjacent boards to each other.

Features:

Recommended Voltage: 5VDC Max Voltage: 5.5VDC Current Draw: 5 mA Three Control Settings A - sets the position the servo sits in while the switch is open B - sets the position the servo moves to when the switch is closed C - sets the time it takes to get from A to B and back Easy Control with Potentiometers Configurable Input Polarity Configurable Response Mode Compatible with Analog Servos ISP Header pins Available for Reprogram GitHub Sparkfun link:https://www.sparkfun.com/products/13118 enter image description here

Documents

SparkFun_Servo_Trigger_v10a SCH

SparkFun_Servo_Trigger_v10a PCB

BOM

ID Name Designator Footprint Quantity
1 FRAME-LETTER FRAME1 CREATIVE_COMMONS 1
2 10K R4,R5,R6 0603-RES 3
3 AVR_SPI_PRG_6 JP9 2X3 1
4 ATTINY84 U1 SO14 1
5 10k R1,R2,R3 TRIMPOT_5MM 3
6 M021X02_NO_SILK JP1,JP3,JP4 1X02_NO_SILK 3
7 SERVO-OUT JP2 1X03_NO_SILK 1
8 OSHW-LOGO LOGO1 OSHW-LOGO-M 1
9 SFE_LOGO_NAME LOGO2 SFE_LOGO_NAME_.2 1
10 N.O. SJ1,SJ2 PAD-JUMPER-2-NO_YES_SILK 2
11 0.1uF C5 0603-CAP 1
12 10uF C1 EIA3216 1
13 16MHZ Y1 RESONATOR-SMD 1
14 STAND-OFF STANDOFF1,STANDOFF2,STANDOFF3,STANDOFF4 STAND-OFF 4
15 SFE_LOGO_FLAME LOGO3 SFE_LOGO_FLAME_.2 1
16 TEST-POINT3X4 TP1,TP2,TP3 PAD.03X.04 3
17 FIDUCIAL FID1,FID2 FIDUCIAL-1X2 2

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