Thanks Ytai for the proposal.
I try to build something similar to
that:
http://www.co2meters.com/Documentation/AppNotes/AN128-%20Cozir_Arduino.pdf
. Which from a electronic schema is rather straight forward. Documentation
of the sensor:
http://www.co2meters.com/Documentation/Manuals/Manual-COZIR-Sensor.pdf
I connect to the 3.3V of the IOIO, one of the GND and finally pin 12,14 for
the RX,TX
My code extract:
In Setup:
uart_ = ioio_.openUart(12,14,9600,Uart.Parity.NONE,Uart.StopBits.ONE);
uart_input = uart_.getInputStream();
uart_output = uart_.getOutputStream();
In Loop:
int availableBytes =uart_input.available();
if (availableBytes > 0) {
int command = uart_input.read();
switch (command)
{
case 'Z' :
// nerver goes here always get 0 as command with only one byte
String CO2Filtered = String.valueOf((char)(uart_input.read())) +
String.valueOf((char)(uart_input.read())) +
String.valueOf((char)(uart_input.read())) +
String.valueOf((char)(uart_input.read()));
setCO2Text(CO2Filtered);
break;
case 'z' :
// never goes here
String CO2NonFiltered = String.valueOf((char)(uart_input.read())) +
String.valueOf((char)(uart_input.read())) +
String.valueOf((char)(uart_input.read())) +
String.valueOf((char)(uart_input.read()));
setCO2Text(CO2NonFiltered);
break;
}
Normally the sensor should start to fire immediately but in my case I get
maximum on byte with a 0 value (thus no Z)
I tried to push command with
uart_output.write("Z \r\n".getBytes());
uart_output.flush();
Thread.sleep(500);
int n = uart_input.available();
if (n>0)
{ // never goes here
int a = uart_input.read();
a = uart_input.read();
a = uart_input.read();
a = uart_input.read();
a = uart_input.read();
By the way, I am connecting with the IOIO through Bluetooth. Could that
make a difference?
Thanks in advance
B.
On Wednesday, December 24, 2014 4:03:51 AM UTC+1, Ytai wrote:
>
> I'm not familiar with such a tutorial except the information on the IOIO
> wiki. How about you share your circuit, which sensor you're using and the
> relevant piece of your code and I'll try to help.
> On Dec 23, 2014 3:14 PM, "Ben" <[email protected] <javascript:>> wrote:
>
>> Hello,
>> Since 2 days I am struggling trying to connect the IOIO to a sensor
>> through UART. I tried 2 different sensor models and 2 different IOIO (in
>> case one has a defect). Still does not work. When I loop RX with TX, I can
>> read whatever I have sent but once connected to the sensor: silence.
>>
>> Can one point us to a kind of tutorial how to connect the IOIO with a
>> UART sensor (including the electronic schema, sensor model, and source
>> code)? I guess that if I would be successful with such tutorial, I could
>> deduce what is wrong with my setting.
>>
>> Many thanks,
>>
>> B.
>>
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