diff --git a/Mesures/humidity/bolo-thingspeak/0_cron.lua b/Mesures/humidity/bolo-thingspeak/0_cron.lua
index c50ec84..b43d674 100644
--- a/Mesures/humidity/bolo-thingspeak/0_cron.lua
+++ b/Mesures/humidity/bolo-thingspeak/0_cron.lua
@@ -1,14 +1,20 @@
 -- Petit script pour faire office de crontab pour les mesures
-print("\n 0_cron.lua   zf200119.1009   \n")
+print("\n 0_cron.lua   zf200119.1436   \n")
 
 cron1=tmr.create()
 cron1:alarm(20*1000,  tmr.ALARM_AUTO, function()
     if verbose then print("cron1........................") end
     if verbose then gpio.write(zLED, gpio.LOW) tmr.delay(10000) gpio.write(zLED, gpio.HIGH) end
-    ztemp1=readTemp()   zhum1=readHumi()
-    if verbose then print("Temperature: "..ztemp1.." °C") end
-    if verbose then print("Humidity: "..zhum1.." %") end
-    zurl=thingspeak_url.."field1="..tostring(ztemp1).."&field2="..tostring(zhum1)
-    send_data() ztemp1=nil zhum1=nil r=nil
-    if verbose then print(node.heap()) collectgarbage() print(node.heap()) end
+
+    f = "0_htu21d.lua"   if file.exists(f) then dofile(f) end
+
+    zurl = thingspeak_url.."field1="..tostring(ztemp1).."&field2="..tostring(zhum1)
+
+    f = "0_send_data.lua"   if file.exists(f) then dofile(f) end
+
+    ztemp1=nil zhum1=nil
+
+    if verbose then print(node.heap()) end
+    collectgarbage()
+    if verbose then print(node.heap()) end
 end)
diff --git a/Mesures/humidity/bolo-thingspeak/0_htu21d.lua b/Mesures/humidity/bolo-thingspeak/0_htu21d.lua
index 85a86fb..4acade6 100644
--- a/Mesures/humidity/bolo-thingspeak/0_htu21d.lua
+++ b/Mesures/humidity/bolo-thingspeak/0_htu21d.lua
@@ -1,42 +1,43 @@
 -- Lit le capteur I2C HTU21D de mesure d'humidité et de température
-print("\n 0_htu21d.lua zf200119.0957 \n")
+print("\n 0_htu21d.lua   zf200119.1426 \n")
 
--- module https://learn.sparkfun.com/tutorials/htu21d-humidity-sensor-hookup-guide/all
--- acahat https://www.aliexpress.com/item/32480177429.html
--- schéma https://github.com/sparkfun/HTU21D_Breakout/blob/master/hardware/SparkFun_HTU21D_Breakout.pdf
--- data sheet https://cdn.sparkfun.com/assets/6/a/8/e/f/525778d4757b7f50398b4567.pdf
--- Comparaison DHT22, AM2302, AM2320, AM2321, SHT71, HTU21D, Si7021, BME280
---             http://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html
--- théorie http://electromag1.wifeo.com/capteurs-de-temperature-et-humidite-gy-21-et-si7021.php
--- source lua: https://github.com/tebben/NodeMCU
+-- https://github.com/zuzu59/NodeMCU_Lua/tree/master/Mesures/humidity/bolo-thingspeak/docu/HTU21D.txt
 
--- ATTENTION: il n'y a seulement que certaines combinaisons de pins qui fonctionnent avec le capteur HTU21D avec le NodeMCU !
+function readHTU21D()
+    id = 0   sda = 5   scl = 6   addr = 0x40
+    HUMIDITY = 0xE5   TEMPERATURE = 0xE3
+    i2c.setup(id, sda, scl, i2c.SLOW)   sda = nil   scl = nil
 
-id = 0   sda = 5   scl = 6   addr = 0x40
-HUMIDITY = 0xE5   TEMPERATURE = 0xE3
-i2c.setup(id, sda, scl, i2c.SLOW)   sda = nil   scl = nil
+    function read_HTU21D(zreg, zdelay)
+        i2c.start(id)   i2c.address(id, addr, i2c.TRANSMITTER)
+        i2c.write(id, zreg)   i2c.stop(id)
+        i2c.start(id)   i2c.address(id, addr, i2c.RECEIVER)
+        tmr.delay(zdelay)
+        r = i2c.read(id,3)   i2c.stop(id)
+        return r
+    end
 
-function read_HTU21D(zreg, zdelay)
-    i2c.start(id)   i2c.address(id, addr, i2c.TRANSMITTER)
-    i2c.write(id, zreg)   i2c.stop(id)
-    i2c.start(id)   i2c.address(id, addr, i2c.RECEIVER)
-    tmr.delay(zdelay)
-    r = i2c.read(id,3)   i2c.stop(id)
-    return r
+    function readTemp()
+        r = read_HTU21D(TEMPERATURE, 50000)
+        r = (bit.band((bit.lshift(string.byte(r,1),8)+string.byte(r,2)),0xfffc)*17572)/65536-4685
+        return tonumber(string.format("%.1f", tostring(r/100)))
+    end
+
+    function readHumi()
+        r = read_HTU21D(HUMIDITY, 16000)
+        r = (bit.band((bit.lshift(string.byte(r,1),8)+string.byte(r,2)),0xfffc)*12500)/65536-600
+        return tonumber(string.format("%.1f", tostring(r/100)))
+    end
+
+    ztemp1=readTemp()   zhum1=readHumi()
+    if verbose then print("Temperature: "..ztemp1.." °C") end
+    if verbose then print("Humidity: "..zhum1.." %") end
+
+    id=nil sda=nil scl=nil addr=nil HUMIDITY=nil TEMPERATURE=nil r=nil
+    read_HTU21D=nil readTemp=nil readHumi=nil readHTU21D=nil
+    if verbose then print(node.heap()) end
+    collectgarbage()
+    if verbose then print(node.heap()) end
 end
 
-function readTemp()
-    r = read_HTU21D(TEMPERATURE, 50000)
-    r = (bit.band((bit.lshift(string.byte(r,1),8)+string.byte(r,2)),0xfffc)*17572)/65536-4685
-    return tonumber(string.format("%.1f", tostring(r/100)))
-end
-
-function readHumi()
-    r = read_HTU21D(HUMIDITY, 16000)
-    r = (bit.band((bit.lshift(string.byte(r,1),8)+string.byte(r,2)),0xfffc)*12500)/65536-600
-    return tonumber(string.format("%.1f", tostring(r/100)))
-end
-
-print("Temperature: "..readTemp().." °C")
-print("Humidity: "..readHumi().." %")
-r = nil
+readHTU21D()
diff --git a/Mesures/humidity/bolo-thingspeak/0_send_data.lua b/Mesures/humidity/bolo-thingspeak/0_send_data.lua
index 0ba8f1b..5fcd501 100644
--- a/Mesures/humidity/bolo-thingspeak/0_send_data.lua
+++ b/Mesures/humidity/bolo-thingspeak/0_send_data.lua
@@ -1,5 +1,5 @@
 -- Petit script pour envoyer les valeurs de température sur un serveur WEB via un HTTP GET
-print("\n 0_send_data.lua   zf200119.1009   \n")
+print("\n 0_send_data.lua   zf200119.1433   \n")
 
 function send_data()
     if verbose then print("send_data_web: ") end
@@ -14,8 +14,10 @@ function send_data()
             end
             zurl=nil
         end)
+    zurl=nil send_data=nil
+    if verbose then print(node.heap()) end
+    collectgarbage()
+    if verbose then print(node.heap()) end
 end
 
---[[
 send_data()
-]]
diff --git a/Mesures/humidity/bolo-thingspeak/_zremote_cmd.txt b/Mesures/humidity/bolo-thingspeak/_zremote_cmd.txt
index c3ce6d0..a1f0dc0 100644
--- a/Mesures/humidity/bolo-thingspeak/_zremote_cmd.txt
+++ b/Mesures/humidity/bolo-thingspeak/_zremote_cmd.txt
@@ -1,9 +1,10 @@
 # Quelques commandes remote (luatool) à envoyer avec le plugin Atom-IDE-terminal de l'éditeur Atom
-# zf200119.1034
+# zf200119.1043
 
 
 Todo à faire pour ce projet !
 
+- faire que send_data et read_temp soient lancés à la volée afin d'économiser de la RAM quand ce n'est pas utilisé
 - arrêter de demander de connecter le WIFI automatiquement en mode station juste après le boot dans la config wifiinit (automatic connect)
 - lancement ou arrêt du WEBIDE via la home page
 - le wifi setup ne fonctionne toujours pas quand il y a déjà un ap de connecté (problème du reboot quand adrs ip ok)!
@@ -81,11 +82,13 @@ telnet -rN $zIP $zport
 verbose=false
 ~.
 
+=node.heap()
+collectgarbage()
+=node.heap()
+
 
 dofile("dir.lua")
 dir()
-collectgarbage()
-=node.heap()
 for k,v in pairs(_G) do print(k,v) end
 dofile("wifi_info.lua")
 
diff --git a/Mesures/humidity/bolo-thingspeak/boot.lua b/Mesures/humidity/bolo-thingspeak/boot.lua
index ccead74..0f85672 100644
--- a/Mesures/humidity/bolo-thingspeak/boot.lua
+++ b/Mesures/humidity/bolo-thingspeak/boot.lua
@@ -1,19 +1,18 @@
 -- Scripts à charger après le boot pour démarrer son projet
 
-print("\n boot.lua zf20015.1700 \n")
+print("\n boot.lua zf20019.1438 \n")
 
 function boot()
-
+    verbose = true
     print("booooooooooot...")
     print(node.heap()) collectgarbage() print(node.heap())
 
-    f= "0_htu21d.lua"   if file.exists(f) then dofile(f) end
-    f= "0_send_data.lua"   if file.exists(f) then dofile(f) end
-    f= "0_cron.lua"   if file.exists(f) then dofile(f) end
-    --f= "web_ide2.lua"   if file.exists(f) then dofile(f) end
-    
-    f=nil boot=nil
-    verbose = true
+    f="0_htu21d.lua"   if file.exists(f) then dofile(f) end
+    zurl=thingspeak_url.."field1="..tostring(ztemp1).."&field2="..tostring(zhum1)
+    f="0_send_data.lua"   if file.exists(f) then dofile(f) end
+    f="0_cron.lua"   if file.exists(f) then dofile(f) end
+    --f = "web_ide2.lua"   if file.exists(f) then dofile(f) end
 
+    f=nil boot=nil
 end
 boot()
diff --git a/Mesures/humidity/bolo-thingspeak/docu/HTU21D.txt b/Mesures/humidity/bolo-thingspeak/docu/HTU21D.txt
new file mode 100644
index 0000000..ac5d6e8
--- /dev/null
+++ b/Mesures/humidity/bolo-thingspeak/docu/HTU21D.txt
@@ -0,0 +1,10 @@
+-- module https://learn.sparkfun.com/tutorials/htu21d-humidity-sensor-hookup-guide/all
+-- achat https://www.aliexpress.com/item/32480177429.html
+-- schéma https://github.com/sparkfun/HTU21D_Breakout/blob/master/hardware/SparkFun_HTU21D_Breakout.pdf
+-- data sheet https://cdn.sparkfun.com/assets/6/a/8/e/f/525778d4757b7f50398b4567.pdf
+-- Comparaison DHT22, AM2302, AM2320, AM2321, SHT71, HTU21D, Si7021, BME280
+--             http://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html
+-- théorie http://electromag1.wifeo.com/capteurs-de-temperature-et-humidite-gy-21-et-si7021.php
+-- source lua: https://github.com/tebben/NodeMCU
+
+-- ATTENTION: il n'y a seulement que certaines combinaisons de pins qui fonctionnent avec le capteur HTU21D avec le NodeMCU !