EEL 3926L Junior Design Fall 2020
Final Project Schema=c and BOM Assignment - RangeFinder
1.0 Descrip=on – This document describes the expecta4ons for comple4on of the RangeFinder
project schema4c and BOM for Junior Design.
2.0 Deliverables -
a. Please complete the electrical schema4c diagram for your rangefinder project. (.SCH file)
b. Please create a complete bill of materials for your rangefinder project. (.xlsx)
Please upload the files associated with a and b above to the webcourses week 11-12
rangefinder project schema4c assignment before the due date.
3.0 Design Content - Your final design schema4c submission must meet the following
requirements.
Component Required/Optional Symbol and Footprint
MCU Required already done
battery holder Required
use “diy-modules.lbr”
Version 1.8.0
www.diymodules.org/eagle
use search field with
“BATTERY-HOLDER-2AA”
Ultrasonic Sensor Required
use “diy-modules.lbr”
Version 1.8.0
www.diymodules.org/eagle
use search field with
“hc-sr04 eagle library”
Display Required
use “diy-modules.lbr”
Version 1.8.0
www.diymodules.org/eagle
use search field with
“TUXGR_16X2_R2”
in display-lcd.lbr
3.3 V DC-DC Conversion Required already done
5 V DC-DC Conversion Required already done
Power on/off switch Required SMD/SMT SPST
slider switch is recommended
Display Connector Required or PCB Mounted not needed if mounted to PCB
Programming Pins Required same as LPF - 5 pin header
4.0 Hardware connec=ons for the MSP430G2553 or MSP430G2231 - Please all of the
components detailed above to your Eagle project schema4c diagram. Make sure that all
components added have both symbols and footprints.
4.1 Microcontroller and Ultrasonic Sensor Connec=ons - Aber adding the ultrasonic
sensor to your schema4c make the following connec4ons.
a. Connect P1.0 on the MSP430G2553 to the Trigger pin of the HC-SR04 Ultrasonic
Sensor
b.Connect the Echo pin of the HC-SR04 Ultrasonic Sensor to a 1K resistor, then connect
the other terminal of the 1K resistor to a 2K resistor. Connect the other terminal of the
2K resistor to GND. Connect P1.1 on the MSP430 to the junc4on of the 1K and
2K resistors. This is a voltage divider circuit that drops the 5V ECHO to 3.3V for input to
the MSP430G2553. Note: P1.1 is the input for Timer A0 - Compare/Capture input. See
the block diagram below.
c. Connect VCC and GND on the HC-SR04 Ultrasonic Sensor to 5V and GND. 4.2 Microcontroller and LCD Connec=ons - Aber adding the LCD to your schema4c make
the following connec4ons.
a. Connect P1.2 to EN on the LCD
b. Connect P1.3 to RS on the LCD
c. Connect P1.4 to D4 on the LCD
d. Connect P1.5 to D5 on the LCD
e. Connect P1.6 to D6 on the LCD
f. Connect P1.7 to D7 on the LCD
g. Connect A (LED backlight posi4ve) on the LCD to 5V
h. Connect K (LED backlight nega4ve) on the LCD to GND
i. Connect RW on the LCD to GND
j. Connect a 1K Ohm resister to V0 (VEE, CONSTR) on the LCD and then connect the
resistor to GND. This value determines contrast. Without a resistor all dots are always
visible, too high a resistor value may mean dots not at all displayed. You may need to use
a value (1K-10K Ohms).
MCU Reset switch Optional your choice
Power On LEDs Optional your choice
4.3 Block Diagram - These connec4ons are represented in the block diagram below.
Note: The LCD contrast pin may be labeled VO, VEE, or CONTR.
5.0 Hardware connec=ons for the MSP430FR6989 - Please all of the components detailed
above to your Eagle project schema4c diagram. Make sure that all components added have
both symbols and footprints.
5.1 Microcontroller and Ultrasonic Sensor Connec=ons - Aber adding the ultrasonic
sensor to your schema4c make the following connec4ons.
a. Connect P1.4 on the MSP430FR6889 to the Trigger pin of the HC-SR04 Ultrasonic
Sensor
b.Connect the Echo pin of the HC-SR04 Ultrasonic Sensor to a 1K resistor, then connect
the other terminal of the 1K resistor to a 2K resistor. Connect the other terminal of the
2K resistor to GND. Connect P1.5 on the MSP430FR6889 to the junc4on of the 1K and
2K resistors. This is a voltage divider circuit that drops the 5V ECHO to 3.3V for input to
the MSP430.
c. Connect VCC and GND on the HC-SR04 Ultrasonic Sensor to 5V and GND. 5.2 Microcontroller and LCD Connec=ons - Aber adding the LCD to your schema4c make
the following connec4ons.
a. Connect P2.2 to EN on the LCD
b. Connect P2.3 to RS on the LCD
c. Connect P2.4 to D4 on the LCD
d. Connect P2.5 to D5 on the LCD
e. Connect P2.6 to D6 on the LCD
f. Connect P2.7 to D7 on the LCD
g. Connect A (LED backlight posi4ve) on the LCD to 5V
h. Connect K (LED backlight nega4ve) on the LCD to GND
i. Connect RW on the LCD to GND
j. Connect a 1K Ohm resister to V0 (VEE, CONSTR) on the LCD and then connect the
resistor to GND. This value determines contrast. Without a resistor all dots are always
visible, too high a resistor value may mean dots not at all displayed. You may need to use
a value (1K-10K Ohms).
5.3 Block Diagram - These connec4ons are represented in the block diagram below.
Note: The LCD contrast pin may be labeled VO, VEE, or CONTR.