iot-kit-esp8266-latest ---> issue for using api_dht.js

renleh

Hi,

I am using Nodemcu broad (ESP12E) to develop my DHT 11 sensor app. Here is my code :

load("api_dht.js");
print('Hello');

let dht = DHT.create(5, DHT.DHT11);
print('Temperature:', dht.getTemp());

I connect my the data port of DHT11 sensor to D1 (GPIO05). The VCC is 3.3v.

I will see the log from "mos tool ui console".

[Aug 26 15:53:40.432] mg_rpc_channel_mqtt 0x3fff106c esp8266_2BCC89/rpc/#
[Aug 26 15:53:40.438] mg_rpc_channel_uart 0x3fff1334 UART0
[Aug 26 15:53:40.443] mgos_init Init done, RAM: 52328 total, 44116 free, 43584 min free
_[Aug 26 15:53:40.524] Hello
[Aug 26 15:53:40.536] Temperature: 9223372036854775807 _
[Aug 26 15:53:40.543] mongoose_poll New heap free LWM: 41304
[Aug 26 15:53:40.548] mgos_net_on_change_c WiFi STA: connecting
[Aug 26 15:53:42.555] scandone

You can see that the Temperature is not correct.

I use the same H/W configuration to test the DHT11 sensor on Arduino IDE. The Temperature is correct. Can anyone tell me how can I solve it ?

Thanks.

Paul Wang

michaelfung

I suggest to add these:

let dht11 = DHT.create(dht_pin, DHT.DHT11);
if (dht11 === null) print('DHT sensor not detected.');

renleh

Hi Michael,

I modified my code:

let dht11 = DHT.create(5, DHT.DHT11);
if (dht11 === null) {
print('DHT sensor not detected.');
} else {
print ('DHT sensor detected!');
print('Temperature:', dht11.getTemp());
}

Then I get the following result.

[Aug 28 10:45:29.268] DHT sensor detected!
[Aug 28 10:45:29.294] Temperature: 9223372036854775807

It is a strange thing. If I disconnected DHT11 sensor with ESP12E (Nodemcu board) , I still get the same output message. Do you have any other suggestion ?

Regards,

Paul Wang

renleh

Hi,

I solve my issue. "My mos tool" version is "latest".

I use another library "api_arduino_dht.js".

I don't understand why "api_dht.js" can not work. I hope someone can show me how to use "api_dht.js" correctly.

Here is my code for "init.js".

load("api_gpio.js");
load("api_timer.js");
load("api_arduino_dht.js");


// Call every second
Timer.set(1000, true, function() {
  let value = GPIO.toggle(2);
  print(value ? 'Tick' : 'Tock');

  let dht = DHT.create(5, DHT.DHT11);


  print("Temperature:",dht.readTemperature(0,0));

  print("Humidity:", dht.readHumidity(0));


}, null);

Here is the code for my "mos.yml".

author: mongoose-os
description: An empty app that does nothing
version: 1.0

libs_version: ${mos.version}
modules_version: ${mos.version}
mongoose_os_version: ${mos.version}

# Optional. List of tags for online search.
tags:
  - c

# List of files / directories with C sources. No slashes at the end of dir names.
sources:
  - src

# List of dirs. Files from these dirs will be copied to the device filesystem
filesystem:
  - fs

# Custom configuration entries, settable via "device configuration"
# Below is a custom firmware configuration example.
# Uncomment and modify according to your needs:

# config_schema:
#  - ["my_app", "o", {title: "My app custom settings"}]
#  - ["my_app.bool_value", "b", false, {title: "Some boolean value"}]
#  - ["my_app.string_value", "s", "", {title: "Some string value"}]
#  - ["my_app.int_value", "i", 123, {title: "Some integer value"}]

# These settings get compiled into the C structure, and can be accessed
# from the C code this way:
#
# printf("Hello from %s!\n", get_cfg()->device.id);
#
# Settings are cool: can be modified remotely without full firmware upgrade!
#
# To see all available compiled settings, buid the firmware and open
# build/gen/sys_config.c or build/gen/sys_config.h file.
#
# Also, in this config_schema section, you can override existing
# settings that has been created by other libraries. For example, debug log
# level is 2 by default. For this firmware we can override it to 3:
#
# config_schema:
#  - ["debug.level", 3]



# List of libraries used by this app, in order of initialisation
libs:
  - origin: https://github.com/mongoose-os-libs/ca-bundle
  - origin: https://github.com/mongoose-os-libs/rpc-service-config
  - origin: https://github.com/mongoose-os-libs/rpc-service-fs
  - origin: https://github.com/mongoose-os-libs/rpc-uart
  - origin: https://github.com/mongoose-os-libs/wifi
  - origin: https://github.com/mongoose-os-libs/mjs
 _** - origin: https://github.com/mongoose-os-libs/arduino-adafruit-dht**_

# Used by the mos tool to catch mos binaries incompatible with this file format
manifest_version: 2017-05-18

Regards,

Paul Wang

michaelfung

Mongoose OS is still evolving rapidly, so I am not surprised that old code does not work anymore.

ru

@renleh, dht lib was fixed for DHT11 sensor. Please check, if this is still relevant.