Search found 7 matches

by jeffrey.yung
Wed May 18, 2016 6:12 pm
Forum: Grove
Topic: Grove - Relay does not work
Replies: 9
Views: 5926

Re: Grove - Relay does not work

Hi Kavi,

Any idea? Thanks.
by jeffrey.yung
Tue May 17, 2016 12:10 pm
Forum: Grove
Topic: Grove - Relay does not work
Replies: 9
Views: 5926

Re: Grove - Relay does not work

Hi Kavi, Nothing is really special: connecting the live wire to one terminal on the relay, another terminal is connected to a 220V fan; the neutral wire is connected to the other wire of the fan.It works as long as the relay switches properly. (If you look at the photo, the black wire going out from...
by jeffrey.yung
Fri May 06, 2016 11:06 pm
Forum: Grove
Topic: Grove - Relay does not work
Replies: 9
Views: 5926

Re: Grove - Relay does not work

jeffrey.yung wrote:hi Jeffery,

There is an on board status indicator LED in the Grove Relay which will light up when the terminal gets closed.The Grove Relay is a normally open type.

Thanks and Regards
I am referring to detection through function call, not visual inspection. Thanks.
by jeffrey.yung
Fri May 06, 2016 11:04 pm
Forum: Grove
Topic: Grove - Relay does not work
Replies: 9
Views: 5926

Re: Grove - Relay does not work

Hi Kavi, I conducted a few tests that still having the problem. I can only switch on once using D2, after I switched it off, then tried to switch it on again, it refused and the red LED in the GrovePi+ turned on. I recycled the power on the Pi3, the red LED in GrovePi+ turned off, but the relay does...
by jeffrey.yung
Thu May 05, 2016 7:40 pm
Forum: Grove
Topic: Grove - Relay does not work
Replies: 9
Views: 5926

Re: Grove - Relay does not work

Hi Kavi, I moved it to D2 and it seems to work now, will run a few more tests to make sure. BTW, is there any way to query the status, whether the relay is on or off?
by jeffrey.yung
Mon May 02, 2016 2:49 pm
Forum: Grove
Topic: Grove - Relay does not work
Replies: 9
Views: 5926

Grove - Relay does not work

Hi, the relay can be controlled through python and I can hear the sound on state transition from on to off or reverse, as well as the LED on and off respectively. However, when I connect a 220V computer fan, I hear the sound from off to on only and the fan cannot be switched on, nor the LED on the b...
by jeffrey.yung
Fri Apr 29, 2016 12:00 am
Forum: Grove
Topic: BMP180: Error accessing 0x77: Check your I2C address
Replies: 1
Views: 2188

BMP180: Error accessing 0x77: Check your I2C address

Hi, I've already modified the class Adafruit_I2C with the following, def __init__(self, address, busnum=-1, debug=False): ..... self.bus = smbus.SMBus(1); but still getting "Error accessing 0x77: Check your I2C address". Nevertheless, the function call still returns reasonable values of temperature ...