Difference between revisions of "Sensors: MAX31820"

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(Created page with "MAX31820 is a cheaper replacement for the DS18B20 1-Wire (TM) temperature probe. The DS18B20 was originally manufactured by Dallas Semiconductor. Dallas Semi was bought by M...")
 
 
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MAX31820 is a cheaper replacement for the DS18B20 1-Wire (TM) temperature probe.
 
MAX31820 is a cheaper replacement for the DS18B20 1-Wire (TM) temperature probe.
  
The DS18B20 was originally manufactured by Dallas Semiconductor.  Dallas Semi was bought by Maxim.  Maxim continues the 1-Wire line of temperature sensors with the MAX31820.   
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The DS18B20 was originally manufactured by Dallas Semiconductor.  Maxim bought Dallas Semi and continues to manufacture the 1-Wire line of temperature sensors with the MAX31820.   
  
 
The main differences between the DS18B20 and the MAX31820 are:
 
The main differences between the DS18B20 and the MAX31820 are:
Line 8: Line 8:
 
# Price (the MAX31820 is about half the price of the DS18B20).
 
# Price (the MAX31820 is about half the price of the DS18B20).
 
# Counterfeits (the DS18B20 is counterfeited by Russian and Chinese companies).
 
# Counterfeits (the DS18B20 is counterfeited by Russian and Chinese companies).
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 +
 +
* Two MAX31820s installed in a probe designed to slip between two frames
 +
[[File:Max31820-1.jpg|frameless|200px]]
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 +
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* SCAD script to print the probes:
 +
 +
union() {
 +
    translate([2.5,143.7,.4]) rotate ([0,0,15]) cube([1,4,3.6]);
 +
    translate([4.9,143.9,.4]) rotate ([0,0,-15]) cube([1,4,3.6]);
 +
    translate([1.45,147.5,.4]) cube([1,4,3.6]);
 +
    translate([5.9,147.5,.4])cube([1,4,3.6]);
 +
   
 +
    difference() {
 +
        union(){
 +
            translate([.2,0,0]) cube([8,160,4]);
 +
            translate([4.5,160,0]) scale([1,1,2]) rotate ([90,0,0]) cylinder(2,10,10, $fn=180);
 +
            translate([-1.8,141,0]) cube([12,19,4]);
 +
            translate([6.25,135,0]) rotate ([0,0,-17]) cube([2,7,4]);
 +
            translate([.2,134.4,0]) rotate ([0,0,17]) cube([2,7,4]);     
 +
            }
 +
      translate([1.2,5,.5]) cube([1.4,150,2]);
 +
      translate([3.5,5,.5]) cube([1.4,150,2]);
 +
      translate([5.8,5,.5]) cube([1.4,150,2]);
 +
           
 +
      translate([.2,144,.5]) cube([1.4,9,2]);
 +
      translate([6.8,144,.5]) cube([1.4,9,2]);
 +
   
 +
      translate([1.2,2,.5]) cube([6,8,10]);
 +
      translate([1.2,2,2.4]) cube([6,9,10]);
 +
           
 +
      translate([1.2,14,2.4]) cube([6,7,10]);   
 +
      translate([1.2,132,.5]) cube([6,8,10]);
 +
      translate([1.2,131,2.4]) cube([6,10,10]);
 +
   
 +
      translate([-.7,144,.5]) cube([10,11,10]);
 +
      translate([-.7,144,2.4]) cube([10,6,10]);   
 +
      translate([4.25,161,2])  rotate ([90,0,0]) cylinder(12,1.8,1.8, $fn=180);
 +
      translate([-10,145,-30]) cube([30,30,30]); 
 +
      }
 +
  }

Latest revision as of 19:46, 23 June 2019

MAX31820 is a cheaper replacement for the DS18B20 1-Wire (TM) temperature probe.

The DS18B20 was originally manufactured by Dallas Semiconductor. Maxim bought Dallas Semi and continues to manufacture the 1-Wire line of temperature sensors with the MAX31820.

The main differences between the DS18B20 and the MAX31820 are:

  1. Power supply range (DS18B20 is 3 - 5 VDC, MAX31820 is 3.3 VDC).
  2. Temperature accuracy range (MAX31820 is as accurate but over a narrower temperature range).
  3. Price (the MAX31820 is about half the price of the DS18B20).
  4. Counterfeits (the DS18B20 is counterfeited by Russian and Chinese companies).


  • Two MAX31820s installed in a probe designed to slip between two frames

Max31820-1.jpg


  • SCAD script to print the probes:
union() {
   translate([2.5,143.7,.4]) rotate ([0,0,15]) cube([1,4,3.6]); 
   translate([4.9,143.9,.4]) rotate ([0,0,-15]) cube([1,4,3.6]); 
   translate([1.45,147.5,.4]) cube([1,4,3.6]); 
   translate([5.9,147.5,.4])cube([1,4,3.6]); 
   
   difference() {
       union(){
           translate([.2,0,0]) cube([8,160,4]);
           translate([4.5,160,0]) scale([1,1,2]) rotate ([90,0,0]) cylinder(2,10,10, $fn=180);
           translate([-1.8,141,0]) cube([12,19,4]);
           translate([6.25,135,0]) rotate ([0,0,-17]) cube([2,7,4]);
           translate([.2,134.4,0]) rotate ([0,0,17]) cube([2,7,4]);       
           }
      translate([1.2,5,.5]) cube([1.4,150,2]);
      translate([3.5,5,.5]) cube([1.4,150,2]);
      translate([5.8,5,.5]) cube([1.4,150,2]);
           
      translate([.2,144,.5]) cube([1.4,9,2]);
      translate([6.8,144,.5]) cube([1.4,9,2]);
   
      translate([1.2,2,.5]) cube([6,8,10]);
      translate([1.2,2,2.4]) cube([6,9,10]);
           
      translate([1.2,14,2.4]) cube([6,7,10]);    
      translate([1.2,132,.5]) cube([6,8,10]);
      translate([1.2,131,2.4]) cube([6,10,10]);
   
      translate([-.7,144,.5]) cube([10,11,10]);
      translate([-.7,144,2.4]) cube([10,6,10]);    
      translate([4.25,161,2])  rotate ([90,0,0]) cylinder(12,1.8,1.8, $fn=180);
      translate([-10,145,-30]) cube([30,30,30]);  
      }
  }