Node-RED+ESP8266(tasmota)+LCD1602打造低成本提醒显示器
本帖最后由 渗透之王 于 2021-11-1 20:52 编辑声音提醒虽然好，但有不适合的场景，比如，孩子在睡觉，突然播放音乐？播放开门提醒？自动背古诗？
也许你会和我一样，想要一个悄无声息的提醒器
1、准备材料：
硬件：nodemcu、LCD1602、IIC-1602转接板
OK,11.6+3.5+1.3，数学不好，不算了，当然还有USB线+5V充电器
软件：
node-red
nodemcu pyflasher
tasmota固件
2、烧写固件：这个不是重点，泛泛的截个操作图，
不放心还是说两个重点吧，
a:上电前nodemcu GPIO0要置低（flash按下）
b:选擦除全部固件
如果你一点都不懂，那在论坛搜索“刷Tasmota固件”
如果英文还不错，那我直接放出官方的说明书：https://github.com/arendst/Sonoff-Tasmota/wiki
How to start
You will need some tools to prepare your device for flashing Tasmota and connect it to your Wi-Fi network and MQTT broker.
3、配置端口并连接硬件
此时重启后，是不是看见时间显示了？对，这默认相当于是DIY一个电子时钟了。
(说句不该说的，既然是时钟，那时间一定要准，时区不对，串口发命令backlog Timezone 8更改时区，OK)
4、修改LCD显示模式
backlogDisplayMode 0
大功告成！
此时可以通过DisplayText命令显示字母了 是清除 是关屏幕 是开屏幕
DisplayText parametersIn the list below p stands for parameter and may be a number from 1 to n digits. On monochrome graphic displays things are drawn into a local frame buffer and sent to the display either via the dcommand or automatically at the end of the command.Positioninglp = sets a character line to print at (on LCD display p = {0…}, on TFT display p = {1…})
cp = sets a character column to print at (on LCD display p = {0…}, on TFT display p = {1…})
xp = sets the x position for consecutive prints
yp = sets the y position for consecutive printsText is printed at the last provided position, either l or y for the vertical position, and either x or x for the horizontal position. Neither x nor y are advanced/updated after printing text.Line primitiveshp = draws a horizontal line with length p (x is advanced)
vp = draws a vertical line with length p (y is advanced)
Lp:p = draws a line top:p (x,y are advanced)
kp = draws a circle with radius p
Kp = draws a filled circle with radius p
rp:p = draws a rectangle with p with and p height
Rp:p = draws a filled rectangle with p with and p height
up:p:p = draws a rounded rectangle with p with, p height and p radius
Up:p:p = draws a filled rounded rectangle with p with, p height and p radiusMiscellaneousz = clear the display
i = (re)init the display (in e-Paper mode with partial update)
I = (re)init the display (in e-Paper mode with full update)
d = update the display
Dp = switch display auto updates on(p=1)/off(p=0), when off display must be updated with d
o = switch display off
O = switch display on
ap = p (0..3) set rotation angle
t = display Tasmota time in HH:MM
tS = display Tasmota time in HH:MM:SS
T = display Tasmota date in DD.MM.YY
pp = pad text with spaces, positive values align left, negative values align right
sp = set text scaling for classic GFX font (scaling factor 1...N)
fp = set font (1=12, 2=24,(opt 3=8)) if font==0 the classic GFX font is used, if font==7 RA8876 internal font is used
Cp = set foreground color (0,1) for black or white and RGB decimal code for color
Bp = set background color (0,1) for black or white and RGB decimal code for color
Cip = set foreground index color (0..18) for color displays (see index color table below)
Bip = set background index color (0..18) for color displays (see index color table below)
wp = draws an analog watch with radius p (#define USE_AWATCH)
Pfilename: = display an rgb 16-bit color image when SD card file system is present
5、node-red流程
文字介绍流程，MQTT中转一下，将数据进行处理，并增加一连串操作。具体为：
a、当收到字符串时，点亮屏幕并显示，10S后背光熄灭，20S后文字清空，和断电状态一样
b、当字符串长度小于16时，在第1行居中显示，当长度大于16时，在第2行显示
放"字符串处理"代码：
var l=msg.payload.length;
var temp=' ';
if(l<=16)
{
var kong_len=(16-l)/2;
msg.payload = '' + temp.substring(0,kong_len)+msg.payload;
}
else
{
msg.payload = ''+msg.payload.substring(0,16)+''+msg.payload.substring(16,32)
}
return msg;
node-red流程导出，只需要修改成你自己的MQTT Broker 即可**** Hidden Message *****
效果展示：
放在桌面，键盘前，不会显得太乱，在办公时，屏幕亮自然会关注一下！
不错不错，，，， 这个实用。关键物料我都还有:lol， 落灰2年了 非常实用，点个32个赞 一斤猪肉六分之一的钱又可以快乐折腾了 谢谢分享 谢谢分享:D 用esp01 比较好，小巧 收藏学习 tang5275 发表于 2019-9-5 10:37
用esp01 比较好，小巧
是的，esp01小巧，Nodemcu方便快捷