1. Mini Robot Chassis Top View
Use the extra hex standoff screw pillars as shown here.

2. Mini Robot Chassis Front View
Use the extra hex standoff screw pillars as shown here.

3. Mini Robot Chassis Rear View

4. Mini Robot Chassis Top View
Portable USB High Capacity Power Bank; at least 2000mAh

5. Mini Robot Chassis Top View
Battery Pack; connect female to female jumpers

6. Mini Robot Chassis Top View
Use a plastic container to cover the battery pack. Add double-sided tape to connect the Raspberry Pi.

7. Connections to the RaspiRobot HAT
The Raspberry Pi needs to be turned off before you connect the RaspiRobot HAT. Connect the HAT so that it sits over this block of pins:

8. RaspiRobot HAT Left to right on the RaspiRobot Board
Sonar - Plug in the UltraSonic Sensor
5V T E G
VCC Trig Echo GND
Screw Connectors
Unscrew the screws, the pin should be inserted above the plate. Screw down the plate,
OC1+, OC1-, OC2+, OC2-, L-, L+, R-, R+, GND, +V
Not used, Not used, Not used, Not used, Black Lead Left Motor (male to male jumper), Red Lead Left Motor (male to male jumper), Black Lead Right Motor (male to male jumper), Red Lead Right Motor (male to male jumper), Black Lead Battery Pack (male to female jumper), Red Lead Battery Pack (male to female jumper).

9. RaspiRobot HAT
Image from

10. Connections to the RaspiRobot HAT
Use male to male jumper wires

11. Mini Robot Chassis Top View
Raspberry Pi is located on top and connected. Additional duct tape was used to secure the components.
You can run the Raspberry Pi, the RaspiRobot HAT, and a robot from 6 AA batteries without the Power Bank. If you have a Power Bank or are connecting to the adapter, plug in the main power supply before connecting the GND from the AA battery pack.

12. RaspiRobot HAT
The code is from Simon Monk, the developer of the RaspiRobot HAT.
The MIT License (MIT)
Copyright (c) 2015 Simon Monk
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

13. RaspiRobot HAT mkdir RobotFiles
Save the rrb3.py file and the other robot-based programs into the RobotFiles folder.

14. RaspiRobot HAT
The main function which is called by the functions in the rrb3 module. See
from rrb3 import *
from time import sleep
BATTERY_VOLTS = 7.8
MOTOR_VOLTS = 4
rr = RRB3(BATTERY_VOLTS, MOTOR_VOLTS)
# create a RRB3 object

15. RaspiRobot HAT
set_motors(self, left_pwm, left_dir, right_pwm, right_dir)
rr.forward(length_of_time_to_run, motor_speed) calls self.set_motors(speed, 0, speed, 0)
The motor_speed controls the Pulse Width Modulations value. Pulse Width Modulations allows analog output to be simulated. The frequency of the square wave is specified as well as a duty cycle that is measured in percentages. The percentage indicates the percentage of time a digital signal is on over an interval or period of time.

16. RaspiRobot HAT
rr.right(length_of_time_to_run, motor_speed) calls self.set_motors(speed, 1, speed, 0)
rr.left(length_of_time_to_run, motor_speed) calls self.set_motors(speed, 0, speed, 1)
rr.reverse(length_of_time_to_run, motor_speed) calls self.set_motors(speed, 1, speed, 1)
rr.cleanup()
Clean up when completed.

17. Headless Operation
Connecting to a Pi that is not connected to a monitor, keyboard, or mouse.
Menu -> Raspberry Pi Configuration
Change your password from raspberry!
Interfaces -> Enable ssh
Reboot
Connect to your wireless access point
sudo cp /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf.backup
Check the /etc/wpa_supplicant/wpa_supplicant.conf file. This will have your association information. The last network is the default network with which you will be associated when you connect in headless operation.

18. Headless Operation Install putty on Windows or use Linux.
ssh
Create a DHCP reservation on your wireless device for your Raspberry Pi, so that it will receive the same IP address based upon the HWAddr (MAC address) for wlan0.
You may need to clear out any configuration in this file:
sudo nano /etc/dhcpcd.conf