Search found 200 matches

by hong.jiang
Wed Aug 29, 2018 11:59 am
Forum: Grove
Topic: Grove Smart Plant Care Kit Issue
Replies: 2
Views: 116

Re: Grove Smart Plant Care Kit Issue

Hi: Can you take some pictures to let the question more clear? And compiling the warnings has no effect, because we have test. I have checked again,sensors' pin assignments match those in the instruction manual. Here is the code https://github.com/Seeed-Studio/Gardening_demo_Arduino/blob/master/Gard...
by hong.jiang
Tue Aug 28, 2018 5:55 pm
Forum: Raspberry Pi
Topic: I2C Relay Board v1.0: I/O Error 121
Replies: 6
Views: 239

Re: I2C Relay Board v1.0: I/O Error 121

Hi: I have looked up you operation video. I think the probability of code's error is very low ( I test it again ). I think the IIC communication maybe not very stable. In your video, there are two other devices. Since the IIC interface adapts the Open-Drain mechanism, IIC bus needs pull-up resistors...
by hong.jiang
Mon Aug 27, 2018 10:32 am
Forum: Raspberry Pi
Topic: I2C Relay Board v1.0: I/O Error 121
Replies: 6
Views: 239

Re: I2C Relay Board v1.0: I/O Error 121

Hi: Are you using your own script? I don't find any relais.py file in our github.If you don't mind if you can post the script that I can have a check. Here is our github https://github.com/johnwargo/Seeed-Studio-Relay-Board .We have test these .py files and they work well.Please refer to these files.
by hong.jiang
Fri Aug 10, 2018 11:51 am
Forum: Shields
Topic: Question About CENG AT Command on a Lonet SIM808.
Replies: 1
Views: 346

Re: Question About CENG AT Command on a Lonet SIM808.

Hi:
How did you get 35? Which AT Command did you use? Taking a screenshot may be more clear and intuitive.
by hong.jiang
Fri Aug 10, 2018 10:59 am
Forum: Shields
Topic: GPRS Shield v3 questions
Replies: 3
Views: 2069

Re: GPRS Shield v3 questions

Hi: AT Commands for HTTP Application mainly have the following: AT+HTTPINT AT+HTTPTERM AT+HTTTPPARA AT+HTTPDATA AT+HTTPACTION AT+HTTPREAD AT+HTTPSCONT AT+HTTPSTATUS For detailed introduction, please refer to https://github.com/SeeedDocument/GPRS_Shield_V3.0/raw/master/res/AT_Commands_v1.11.pdf
by hong.jiang
Fri Aug 10, 2018 10:33 am
Forum: Shields
Topic: GPRS Shield 2.0 Receiving SMS
Replies: 2
Views: 177

Re: GPRS Shield 2.0 Receiving SMS

Hi:
Could you please give me a screenshot ? This will allow me to understand your problem more intuitively . And I find a AT Command document https://seeeddoc.github.io/GPRS_Shield_ ... _v1.11.pdf that may can help you.The AT+CMGL introdution is on page 102 .
by hong.jiang
Wed Aug 08, 2018 4:53 pm
Forum: Grove
Topic: Air qualitiy sensor v1.3 with alarm
Replies: 5
Views: 789

Re: Air qualitiy sensor v1.3 with alarm

Hi: Could you please take a photo about your hardware? I have tested the code above, and get a right data. https://github.com/SeeedDocument/forum_doc/raw/master/image/air%20quality.png Here is my .ino file https://github.com/SeeedDocument/forum_doc/raw/master/reg/Air_Quality_Sensor.ino , maybe you c...
by hong.jiang
Wed Aug 08, 2018 10:11 am
Forum: Arduino
Topic: Pro Micro Serial Communication Issue
Replies: 0
Views: 368

Re: Pro Micro Serial Communication Issue

Hi:
I find there maybe exist error in serial receive part according to your description. It is very likely that the receive interrupt was not triggered or went wrong when message arrived. You can check the code related serial receive interrupt.
by hong.jiang
Tue Aug 07, 2018 3:20 pm
Forum: Grove
Topic: Oxygen Sensor Question
Replies: 1
Views: 343

Re: Oxygen Sensor Question

Hi: The choice of ADC reference voltage depends on the voltage input of the O2 sensor. If O2 sensor's supply is 5V, Vref is 5V. Otherwise Vref is 3.3V. We just use Seeeduino's adc that can get sensor's data. I use a Seeeduino V4.2 to test it, and can get right data. But the wiki makes a mistakes. It...
by hong.jiang
Mon Aug 06, 2018 2:05 pm
Forum: Grove
Topic: Photon base shield and GROVE temp & humidity sensor .. ¿Analog or digital interface?
Replies: 3
Views: 369

Re: Photon base shield and GROVE temp & humidity sensor .. ¿Analog or digital interface?

Hi: AM2302 is a digital sensor. It should be connected to the digital interface. It includes a capacitive moisture sensing element and a high precision temperature measuring element, and is connected with a high performance 8-bit microcontroller. It communicates with the outside via ONE-WIRE. AM2302...