nafuture-zxn1-resources

Resources for Nafuture ZhiXi-N1

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Introduction

The Nafuture Zhixi-N1 is a low cost temperature and humidity sensor produced by Nafuture (discontinued). It feafures an ESP-12F module (ESP8266), a DHT11 temerature sensor and 2 200mAh LiPo batteries. It has a micro-USB port that you can use to charge the batteries and re-program the ESP-12F module with a custom UART programmer.

You can get one from Taobao for only 4.9 CNY.

On-Board Components

• 1 X ESP-12F (with an LED)
• 1 x DHT11
• 2 x 200mAh LiPo batteries
• 1 additional LED
• 1 x push switch

ESP-12F Pin References

Pin	Connected to
GPIO12	Main LED
GPIO4	DHT11
GPIO2	ESP-12F LED
ADC	VCC through a voltage divider
TXD0	Micro-USB D+
RXD0	Micro-USB D-
GPIO0	Micro-USB ID

Measure VCC (battery) Voltage

Part of the circuit:

            ___ VCC
             |
+-----+    <4.7K>
| ... |      |
| ADC |------+
| ... |      |
+-----+    <1K>
            _|_ 
               GND

Since the ESP8266's ADC is 10-bit (0-1023) from 0 to 1V, the voltage can be calculated based from the ADC reading as follows:

voltage = ADC_reading / 1024 / 10 * 57

How to Update the Firmware of ZXN1 with the Programmer (or you can make a programmer yourself using a micro-USB breakout board and a common USB-UART programmer)

• Connect the programmer to your computer and your ZXN1
• Run the firmware flashing program on your computer (esptool)
• Press the flash key on the programmer, while it's being pressed, start (or restart) your ZXN1
• Wait for the flashing to finish

MicroPython Sample Code

The MicroPython code in this repository simply does a one time measurement of the temperature, humidity and battery voltage on start, and put the values into a string which is broadcasted as a WiFi SSID. You can then check the values from your phone's WiFi settings: (Nothing will happen if you connect to the AP)

See ./upython

How to Use

• Install Thonny IDE (recommended)
• Download the latest micropython firmware (currently V1.13) for ESP8266 from https://micropython.org/download/
• Upload the firmware to your ZXN1 through Thonny (or esptool if you know how to use it)
• Upload battery.py, sensor.py, main.py to your ZXN1 using Thonny
• Restart your ZXN1 to run the code

Where to Buy

• Taobao link for the Nafuture ZhiXi-N1
• Xianyu link for the programmer