Electronic Unit for Pedestrian Acoustic signals

1. ECU for Blind Traffic Signals (c) Dipl. Ing. Achilles Carababas 1
ECU for Pedestrian Acoustic Signals
The focus of this presentation is
the electronic control unit
of tactile and acoustic devices for blind and
partially sighted persons on traffic signals
DIN 32981:2015-10

2. ECU for Blind Traffic Signals (c) Dipl. Ing. Achilles Carababas 2
ECU for Pedestrian Acoustic Signals
Requirements HW:
●
Dual CPU system, SIL3
●
Wi-Fi and Bluetooth
interface
●
BIT I/O 4 out
●
BIT I/O 8 in
●
2 channel audio out 2W
●
2 channel audio in
●
Dimensions 98mm x 222mm x 26mm

3. ECU for Blind Traffic Signals (c) Dipl. Ing. Achilles Carababas 3
ECU for Pedestrian Acoustic Signals
Requirements FW:
●
DIN 32981
●
Audio mit 100dBA
in a distance of 1 m (DIN 45641 )
●
LAieq = 35 dB (A) bis LAieq = 90 dB (A)
●
1W = 0dB SPL
●
A- Filter (A) and level measurement
●
Continuous sound pressure level „Laieq“
calculations
●
RTC clock and batterie

4. ECU for Blind Traffic Signals (c) Dipl. Ing. Achilles Carababas 4
ECU for Pedestrian Acoustic Signals
Special Points:
●
Hardware- coding for speaker
●
2 or 3 speaker channels
●
Selection of input voltages
●
Fuse on board
●
Power consumption of DC equipment <=10W
●
System time for day – night program
changeover
●
SIL 3
●
Low power design

5. ECU for Blind Traffic Signals (c) Dipl. Ing. Achilles Carababas 5
ECU for Pedestrian Acoustic Signals
Block Diagram Prototype:

6. ECU for Blind Traffic Signals (c) Dipl. Ing. Achilles Carababas 6
ECU for Pedestrian Acoustic Signals
Prototype:
●
Setup with moduls
●
Development of HW elektronik
●
Elektronic and schematics
●
Development of firmware

7. ECU for Blind Traffic Signals (c) Dipl. Ing. Achilles Carababas 7
ECU for Pedestrian Acoustic Signals
Thank you for your attention
For any questions conntact
achilles.carababas@t-online.de