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Wireless-Gate-Controller

This is a project for E-design 314, a course hosted by Stellenbosch University.

What does it do? It opens a gate, quite simply.

It is built on a prototype board developed by Stellenbosch University. The routing is minimal, however, and the idea is that students develop their own wiring/designs.

Here is the report: [goo.gl/RYua6i]goo.gl/RYua6i

Of the main hardware, it has a Renesas RL78/G14 as the brains, a Powertip 16x1 lcd for user feedback, external FT230XS uart chip to communicate with an external test program at 9600 baud, a DRV8801 motor driver (40kHz PWM), a TSOP348X infra-red receiver, and a 2kHz buzzer for warning conditions.

There also exists an infra-red remote to control the gate (open/close/emergency stop). The heart is a Renesas RL78/G12 1026A processor. I call it the heart rather affectionately since I had a watchdog timer going off which gave it a pretty heartbeat. I have also attached a 3.7V 1100mAH lithium battery, which might have been a little bit of an overkill.

Before I built the remote, I soldered in a transmitter/receiver led pair and a button, for testing purposes and so that coding is faster.

  • Variable motor speed works
  • ADC current reading + display reading works.
  • Infrared tx (manchester encoding) works on G12. (tx also on G14 -- just for debugging/testing purposes).
  • Receive also works and displays bits on lcd.

TODO:

  • Add 3G. (Open with a cellphone anywhere in the world).
  • Possibly add a card reader.

Debugging: have a look at the debug.h folder and change variables in core_setup() to enable certain serial/lcd debugging outputs

All buttons and switches are connected with pull-up resistors as standard.

When a new event occurs, the lcd will update with the latest event (with timestamp) accordingly

One can cycle through the events using up/down menu keys (buttons).

Events include:

  • Opening
  • Opened
  • Closing
  • Closed
  • Autoclosing
  • Autoclosed
  • Mechanical Interference Event

Pinout

G14 Gate controller

CN2

Pin Signal Name RL78/G14 Pin Name Function
1 GND VSS / EVSS Ground
2 VDD VDD / EVDD 5V external input
8 P15 P15_SCK20_Z_SCL20_TRDIOD0 This is the 40kHz pwm enable for the motor (directed to the enable pin of the DRV8801)
9 P16 P16_TIO1_TO01_INTP5_TRDIOC0_IVREF0 This interrupt pin is triggered by data from the IR receiver
10 P17 P17_TI01_TO02_TRDIOA0_TRDCLK0_IVCMP0 This is connected to a button which closes gate upon pressing
11 P55 P55_TIO1_TO01_INTP5_TRDIOC0_IVREF0 This is connected to a button which shows the previous event upon pressing
12 P54 P54_TIO1_TO01_INTP5_TRDIOC0_IVREF0 This is connected to a button which shows the next event upon pressing
13 P53 P53_TIO1_TO01_INTP5_TRDIOC0_IVREF0 This is connected to a button which will stop the gate from moving upon pressing (as if an emergency stop)
14 P52 P52_TIO1_TO01_INTP5_TRDIOC0_IVREF0 This is connected to a button which opens gate upon pressing
15 P51 P51_INTP2_SO00_TXD0_TOOLTXD_TRGIOB For testing. A button triggers this hardware interrupt which in turn sends a test manchestor string.
23 P76 P76_KR6_INTP10_RXD2 LCD Register select
24 P75 P75_KR5_INTP9_SCK01_SCL01 LCD Read /Write
25 P74 P74_KR4_INTP8_SI01_SDA01 LCD Enable
26 P73 P73_KR3_SO01 LCD Data channel 3
27 P72 P72_KR2_SO21 LCD Data channel 2
28 P71 P71_KR1_SI21_SDA21 LCD Data channel 1
29 P70 P70_KR0_SCK21_SCL21 LCD Data channel 0

CN3

Pin Signal Name RL78/G14 Pin Name Function
1 GND VSS / EVSS Ground
2 VDD VDD / EVDD 5V external input
3 P140 P140_PCLBUZ0_INTP6 2kHZ buzzer output
7 P02 P02_ANI17_SO10_TxD1 Serial output to external test program
8 P03 P03_ANI16_SI10_RxD1_SDA10 Serial input from external test program
10 P130 P130 For testing. Here is where a manchestor string is output to a built-in IR led.
11 P20 P20_ANI0_AVREFP Unused ADC input
12 P21 P21_ANI0_AVREFM Unused ADC input TODO: use potentiometer to cycle through menu.
13 P22 P22_ANI2_ANO0 This reads a potentiometer built-in the RL78 G14. It controls the speed of the gate motor.
14 P23 P23_ANI3_ANO1 This reads in a current value from 0 - 100mA, converted to a value between 0 - 5 V, with 10 bit accuracy.
22 P42 P42 This digital output controls the phase/direction that the gate motor is turning.
23 P41 P41 This digital output can sleep the motor driver (nSleep).
27 P06 P06 Digital in which listens for when the gate closes/is closed (port is polled ~ debouncing).
28 P05 P05 Digital in which listens for when the gate opens/is opened (port is polled ~ debouncing).
29 P30 P30/INTP3/RTC1HZ/SCK00/SCL00/TRJO0 Unused. Hardware interrupt which listens for when the gate opens/closes.

G12 Infra-red transmitter

Pin Signal Name RL78/G14 Pin Name Function
3 P41 P41_ANI22_SO01_SDA01_TI02_TO02_INTP1 Open gate button
9 GND VSS Ground
10 VDD VDD 3.3V external input
14 P13 P13_ANI19_TI00_TO00_INTP2 Close gate button
17 P10 P10_ANI16_PCLBUZ0_SCK00_SCL00 IR Led output

Schematic

TODO: create G12 and G14 eagle library schematic