Frage zu BEO IR-Eye Version -- Question about BEO IR-Eye version

7 replies
FR
Frankenberg
Bronze
298 posts
Posted May 27, 2020 at 19:32 GMT
#2139084

Frage zu BEO IR-Eye Version

Ich habe ein IR-Eye erworben und es funktioniert nur der IR Sensor.
Die Part Nr des EYE ist :
8007086161021107
bei diesem Eye ist auch nur eine LED Verbaut (für PLAY), der gesamte Sensor ist in SMD-Technik hergestellt.

Über den I2C-Bus kann ich die Tasten und die LED nicht abfragen,
gibt es irgendwo, oder von Irgendjemanden ein Schaltbild oder nähere Informationen zu diesem EYE ?

Question about BEO IR-Eye version

I have purchased an IR eye and only the IR sensor works.
The Part No. of the EYE is:
8007086161021107
There is only one LED built into this eye (for PLAY), the entire sensor is made using SMD technology.


I cannot query the buttons and the LED via the I2C bus, is there somewhere or somebody a circuit diagram or more information about this EYE?

ST
styppen
Bronze
112 posts
Posted May 28, 2020 at 08:31 GMT
#2139085

Hi Wilfried

I managed to write an Arduino code that is able to interact with the I2C chip on the IR eye. Let me know if you are interested.

FR
Frankenberg
Bronze
298 posts
Posted May 28, 2020 at 09:06 GMT
#2139086

Hello styppen,
I also wrote an Arduino sketch, with which I can determine the I2C address of the built 8574 and with which I can test the 4 buttons and 2 LEDs, as well as the IR function.
Works with 3 other IR Eyes, but not with the type described here.
But I'm always very interested in the Arduino code, can you send it to me by email or PM?

ST
styppen
Bronze
112 posts
Posted May 28, 2020 at 11:22 GMT
#2139087

What is the I2C chip on your version of the IR eye?

FR
Frankenberg
Bronze
298 posts
Posted May 28, 2020 at 13:05 GMT
#2139088

I cannot determine the type of  I2C chip on this IR Eye, the SMD chips are too small and the labeling is illegible, unfortunately I also have no circuit diagram of this IR Eye.

if I connect an Arduino via 10kohm pullup to the I2C bus, the program hangs up and only continues when the I2C bus is disconnected!

Normale the I2C chip is a PCF8574n on the IR Eyes, I don't know if that changed in newer versions or the IR-Eyes!

ST
styppen
Bronze
112 posts
Posted May 29, 2020 at 08:35 GMT
#2139089

I only have experience with PCF8574 I2C. Maybe someone can provide more info regarding the I2C chip in this specific version. 

B(
BeoMotion (archived2)
Bronze
386 posts
Posted May 29, 2020 at 17:44 GMT
#2139090

Looking like one of the newer IR eyes with an embedded MCU and the screw connectors marked with Rx/Tx instead of SDA/SCL. 
So the best bet here is that communication is UART instead of I2C. Without knowing the protocol it might be a lot harder than just directly interfacing with a port expander over I2C. Best way to get started is sniffing the communication with a logic analyzer while the IR eye is connected to a matching newer generation B&O device.

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