Wiki source code of NodeMCU

Version 5.1 by Leon Poon on 2021/01/20 14:20
Hide last authors
Leon Poon 5.1 1 Nodemcu V3 Lua WiFi module integrated ESP8266 + additional 32Mbit FLASH, USB serial port CP2102.
Leon Poon 4.1 2
Leon Poon 5.1 3 {{code language="none" title="dmesg"}}
4 [46271.336289] usb 3-7.2: new full-speed USB device number 14 using xhci_hcd
5 [46271.467461] usb 3-7.2: New USB device found, idVendor=10c4, idProduct=ea60, bcdDevice= 1.00
6 [46271.467463] usb 3-7.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
7 [46271.467465] usb 3-7.2: Product: CP2102 USB to UART Bridge Controller
8 [46271.467467] usb 3-7.2: Manufacturer: Silicon Labs
9 [46271.467468] usb 3-7.2: SerialNumber: 0001
10 [46271.480537] cp210x 3-7.2:1.0: cp210x converter detected
11 [46271.482413] usb 3-7.2: cp210x converter now attached to ttyUSB0
12 {{/code}}
13
Leon Poon 4.1 14 {{code language="ini" title="platformio.ini"}}
15 [env:nodemcuv2]
16 platform = espressif8266
17 board = nodemcuv2
18 framework = arduino
19 lib_deps = arduino-libraries/NTPClient@^3.1.0
20
21 {{/code}}
22
23 Blink all GPIO pin and NTP (uses [[https:~~/~~/platformio.org/lib/show/551/NTPClient/>>https://platformio.org/lib/show/551/NTPClient/]]):
24
25 {{code language="c++" title="main.cpp"}}
26 #include <Arduino.h>
27 #include <ESP8266WiFi.h>
28 #include <WiFiUdp.h>
29 #include <NTPClient.h>
30 const char *ssid = "<ssid>";
31 const char *password = "<wpa_password>";
32
33 WiFiUDP ntpUDP;
34
35 NTPClient timeClient(ntpUDP, "ntp-b.nist.gov", 0, 60000);
36
37
38 void setup() {
39 for (uint8_t i = 0; i <= 5; i++)
40 pinMode(i, OUTPUT);
41 for (uint8_t i = 12; i <= 16; i++)
42 pinMode(i, OUTPUT);
43
44 // Serial.begin(115200);
45
46 WiFi.begin(ssid, password);
47
48 while ( WiFi.status() != WL_CONNECTED ) {
49 delay ( 500 );
50 // Serial.print ( "." );
51 }
52
53
54 timeClient.begin();
55 }
56
57
58 unsigned long t;
59
60
61 void f(uint8_t hl) {
62 timeClient.update();
63 unsigned long t1;
64 for (; (t1 = timeClient.getEpochTime()) == t; delay(1));
65
66 t = t1;
67 // Serial.println(timeClient.getFormattedTime());
68
69 for (uint8_t i = 0; i <= 5; i++)
70 digitalWrite(i, hl);
71 for (uint8_t i = 12; i <= 16; i++)
72 digitalWrite(i, hl);
73 }
74
75 void loop() {
76 f(HIGH);
77 f(LOW);
78 }
79
80 {{/code}}
81
82 {{code language="none" title="Upload log"}}
83 Configuring upload protocol...
84 AVAILABLE: espota, esptool
85 CURRENT: upload_protocol = esptool
86 Looking for upload port...
87 Auto-detected: /dev/ttyUSB0
88 Uploading .pio/build/nodemcuv2/firmware.bin
89 esptool.py v2.8
90 Serial port /dev/ttyUSB0
91 Connecting....
92 Chip is ESP8266EX
93 Features: WiFi
94 Crystal is 26MHz
95 MAC: AA:BB:CC:DD:EE:FF
96 Uploading stub...
97 Running stub...
98 Stub running...
99 Configuring flash size...
100 Auto-detected Flash size: 4MB
101 Compressed 269888 bytes to 199316...
102
103 Writing at 0x00000000... (7 %)
104 Writing at 0x00004000... (15 %)
105 Writing at 0x00008000... (23 %)
106 Writing at 0x0000c000... (30 %)
107 Writing at 0x00010000... (38 %)
108 Writing at 0x00014000... (46 %)
109 Writing at 0x00018000... (53 %)
110 Writing at 0x0001c000... (61 %)
111 Writing at 0x00020000... (69 %)
112 Writing at 0x00024000... (76 %)
113 Writing at 0x00028000... (84 %)
114 Writing at 0x0002c000... (92 %)
115 Writing at 0x00030000... (100 %)
116 Wrote 269888 bytes (199316 compressed) at 0x00000000 in 17.6 seconds (effective 122.6 kbit/s)...
117 Hash of data verified.
118
119 Leaving...
120 Hard resetting via RTS pin...
121 {{/code}}
122
123 {{gallery}}
124 image:front.jpg
125
126 image:back.jpg
127 {{/gallery}}