I added my stacking header next. Make sure the female end faces down
towards the Pi board because desoldering that connector would likely ruin it.
I then added a ground wire from the Pi header area to one side of the
common pin of the SIP resistor, and another wire to the ground bus. A small
jumper connected a small bussed area to
ground to prepare for a screw terminal.
A red LED indicates when the motor
batteries are connected. It’s connected
to the positive side of the screw terminal
(on the left) and to ground through a
470 ohm resistor. Note the ground wires
to the SIP resistor from the Pi header
and the electrolytic capacitor connected
to battery power and ground.
Item Qty Supplier Part# Link Notes
EZasPI (includes stacking header) 1 Mikronauts EZASPI-KIT http://Mikronauts.com Designed for ease of use.
4x3 pin servo header 1 Mikronauts SERVO4CON http://Mikronauts.com Can substitute 3 pieces of 1x4 male
pin header; 3x Mouser 571-826629-4.
8x3 pin servo header 1 Mikronauts SERVO8CON http://Mikronauts.com Can substitute 3 pieces of 1x8 male
pin header; 3x Mouser 571-826926-8.
4.7K 9 resistor bussed SIP10 1 Digi-Key 987-1267-ND www.digikey.com Can substitute 4K7 8 resistor SIP9.
2.4K 5% 1/4W resistor 8 Digi-Key CF14JT2K40CT-ND www.digikey.com 1/6 watt or higher, but do not
substitute value.
Two-screw terminal block 1 Digi-Key CF14JT470RCT-ND www.digikey.com You could solder the battery wires
instead.
Red LED 1 Digi-Key 365-1189-ND www.digikey.com Any 3 mm- 5 mm red LED.
470 ohm resistor 1 Digi-Key CF14JT470RCT-ND www.digikey.com 1/6 watt or higher would work.
100 µF 10V electrolytic capacitor 1 Digi-Key 399-6600-ND www.digikey.com Any 47 µF and up capacitor rated for
AA battery holder 1 Digi-Key BC4AAW-ND www.digikey.com You can get these anywhere —
Nylon M3 18 mm + 6 mm standoff 4 Mikronauts M3-18-6-STDOFF http://Mikronauts.com You can use other standoffs of the
correct height.
Nylon M3 25 mm or more standoff 2 Mikronauts M3-SERVO-STDOFF http://Mikronauts.com Used to mount pan servo.
Nylon M3 12 mm screw 4 Mikronauts M3-12-SCR http://Mikronauts.com
Nylon M3 nut 4 Mikronauts M3-NUT http://Mikronauts.com
SPRITE Kit 1 Mikronauts SPRITE-KIT http://Mikronauts.com Includes items 1-14 above; see
http://Mikronauts.com/robot-zoo/sprite for details.
Major Components
Raspberry Pi 1 Newark RASPBRRY-MODB-512M www.newark.com The Model-A may work, but I have
not tried it.
EZasPI SPRITE kit 1 Mikronauts SPRITE-KIT http://Mikronauts.com
/robot-zoo/sprite See link for details.
Ardubot 1 Budget Robotics Robot-Chassis-Kits-161 www.budgetrobotics.com Chassis must be big enough for
everything and be servo driven.
Wi-Fi adapter 1 Tp-link Low power USB www.newegg.com Netis WF-2111; see http://elinux.
org/RPi_USB_Wi-Fi_Adapters for list
of compatible adapters; choose one
that does not need a powered hub.
Parallax standard servo 1 Digi-Key 900-00005-ND www.digikey.com Other standard servos would work.
Parallax continuous rotation servo 2 Digi-Key 900-00008-ND www.digikey.com Other continuous rotation servos
would work.
Servo wheels 2 RobotShop RB-Sbo-86 www.robotshop.com They have other colors, as well.
SeeedStudio ultrasonic range finder 1 RobotShop RB-See-90 www.robotshop.com You can substitute the Parallax
Servo extension cable 1 RobotShop RB-Pol-180 www.robotshop.com This one is long ... try to find a
shorter one.
Lynxmotion sensor housing 1 RobotShop RB-Lyn- 75 www.robotshop.com Any sensor mount will do.
Patriot power bank 1 NCIX PCPB52002 www.ncix.com If you substitute, make sure the
battery can supply regulated 5V 2A.
NiMH 4xAA batteries and charger 1 NCIX ECH420 www.ncix.com Or equivalent, minimum 1800 mAh
suggested.
You will also need some standard tools: screwdrivers, pliers, wire cutters, wire stripper, soldering iron, hookup wire, and solder.
62 SERVO 01.2014
Photo 7: Resistors and servo header.
Photo 8: Stacking header and
ground wires.
Photo 9: LED, screw terminal,
and GPIO wiring.
