Forum >indicator always blink
indicator always blink
welly 2013-04-22 21:55:10 4301 Views4 Replies Hi Eveyone,
I bought a i/o expansion shield v5.0 to try RS485 transmition and interfaced with Arduino Mega 2560.
[url=http://ppt.cc/RWdC.]http://ppt.cc/RWdC.[/url]
Everything is fine while connecting with usb debug.
But I find the indicator is always blink while charging with batterise,and the scenerio of testing led is not correct.
The connected led just flash once if i set the ledPin to high(it should be always lighted).
Are this problem releated to voltage.
We use batteries 9v(series connection, 1.5v each*6).
Hope you have some ideas.
regards
Welly
I bought a i/o expansion shield v5.0 to try RS485 transmition and interfaced with Arduino Mega 2560.
[url=http://ppt.cc/RWdC.]http://ppt.cc/RWdC.[/url]
Everything is fine while connecting with usb debug.
But I find the indicator is always blink while charging with batterise,and the scenerio of testing led is not correct.
The connected led just flash once if i set the ledPin to high(it should be always lighted).
Are this problem releated to voltage.
We use batteries 9v(series connection, 1.5v each*6).
Hope you have some ideas.
regards
Welly
2013-04-24 19:26:54 Hi Jose:
Thx for your reply, the issue was solved, another issue was as below:
I would like to input a char '1' to set ledPin high and '2' to low, then print the value.
If I don't interface with io expansion shield v5, it works fine.
When i connect to RS485, the scenerio was strange, after input '1', it print 49,50,50,50,....successively.
It should print 49 only once, then I cant' input '2' to set ledPin low.
It confused me a lot. please help me to figure these out.
int EN=2;
int ledPin=13;
if(Serial.available()>0){
// receive data
digitalWrite(EN, LOW);//Enable Receiving Data
val = Serial.read();
if (-1 != val) {
if (val == '1') {
digitalWrite(ledPin, HIGH);
}else if(val = '2'){
digitalWrite(ledPin, LOW);
}
}
// send data
if(val!=-1){
delay(1000);
digitalWrite(EN, HIGH);//Enable data transmit
Serial.println(val, DEC);
}
}
cheers
welly
Thx for your reply, the issue was solved, another issue was as below:
I would like to input a char '1' to set ledPin high and '2' to low, then print the value.
If I don't interface with io expansion shield v5, it works fine.
When i connect to RS485, the scenerio was strange, after input '1', it print 49,50,50,50,....successively.
It should print 49 only once, then I cant' input '2' to set ledPin low.
It confused me a lot. please help me to figure these out.
int EN=2;
int ledPin=13;
if(Serial.available()>0){
// receive data
digitalWrite(EN, LOW);//Enable Receiving Data
val = Serial.read();
if (-1 != val) {
if (val == '1') {
digitalWrite(ledPin, HIGH);
}else if(val = '2'){
digitalWrite(ledPin, LOW);
}
}
// send data
if(val!=-1){
delay(1000);
digitalWrite(EN, HIGH);//Enable data transmit
Serial.println(val, DEC);
}
}
cheers
welly 2013-04-23 21:10:34 [quote="welly"]
error log:
Uploading to I/O board using 'COM6'
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
[/quote]
This is happening because the serial port is blocked with RS485. So when you try to flash a new firmware, it will connect to RS485. Detach the Expansion shield or change the jumpers so the Serial port it is not blocked, that should fix it Jose
error log:
Uploading to I/O board using 'COM6'
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
[/quote]
This is happening because the serial port is blocked with RS485. So when you try to flash a new firmware, it will connect to RS485. Detach the Expansion shield or change the jumpers so the Serial port it is not blocked, that should fix it
Jose 2013-04-23 21:08:30 [quote="welly"]
But I find the indicator is always blink while charging with batterise,and the scenerio of testing led is not correct.
The connected led just flash once if i set the ledPin to high(it should be always lighted).
Are this problem releated to voltage.
We use batteries 9v(series connection, 1.5v each*6).
[/quote]
How are you charging the battery? It might be that the batteries don't have enough power? Jose
But I find the indicator is always blink while charging with batterise,and the scenerio of testing led is not correct.
The connected led just flash once if i set the ledPin to high(it should be always lighted).
Are this problem releated to voltage.
We use batteries 9v(series connection, 1.5v each*6).
[/quote]
How are you charging the battery? It might be that the batteries don't have enough power?
Jose 2013-04-23 01:38:30 Hi Everyone:
Another strange situtaion was as below:
I cannot upload sketch to Arduino Mega 2560 while interfaced with I/O expansion shield v5.
error log:
Uploading to I/O board using 'COM6'
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
regards
Welly
welly
Another strange situtaion was as below:
I cannot upload sketch to Arduino Mega 2560 while interfaced with I/O expansion shield v5.
error log:
Uploading to I/O board using 'COM6'
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
regards
Welly
welly 