{"id":547,"date":"2014-05-04T16:06:39","date_gmt":"2014-05-04T15:06:39","guid":{"rendered":"http:\/\/www.analysir.com\/blog\/?p=547"},"modified":"2019-12-30T13:34:25","modified_gmt":"2019-12-30T13:34:25","slug":"silver-bullet-oscilloscope-infrared-receiver","status":"publish","type":"post","link":"https:\/\/www.analysir.com\/blog\/2014\/05\/04\/silver-bullet-oscilloscope-infrared-receiver\/","title":{"rendered":"‘Silver bullet’ – the Oscilloscope Infrared Receiver"},"content":{"rendered":"

A while ago we came across a website on infrared remote controls which suggested a simple way to view IR signals using an Oscilloscope. The idea is to use a standard IR Led mounted into a BNC\/RCA plug using a spare channel\u00a0 making an Oscilloscope infrared receiver. So we set about ordering the connectors, which arrived in the post today. Another way of looking at this device is as a ‘poor-mans’ IR receiver, but if you have an Oscilloscope to plug it into then maybe you are not so poor after all.<\/p>\n

\"Silver<\/a>
Silver Bullet – Infrared Receiver connected to Channel 1<\/figcaption><\/figure>\n

The idea is to shine your IR remote control on to the IR Led while pressing a key which results in a small amount of current passing through the IR LED. This in turn creates a voltage differential across the terminals of the Led. For this to work well, you need to have the emitter of the remote control right up against the IR LED of the receiver.<\/p>\n

\"Silver<\/a>
Silver Bullet – displaying marks and spaces of IR signal on oscilloscope (1Volt peak, 200mV\/500uSecs per division)<\/figcaption><\/figure>\n

To construct this device, the pins of the IR LED are soldered to the connector with the cathode (-) being connected to negative and the anode (+) being connected to the positive terminal. To get cleaner falls on the signal solder a 22K ohm resistor across the legs of the IR Led. The resistor value isn’t critical as we tried several values down to 7K ohms and didn’t notice any appreciable difference in signal quality. We were pleasantly surprised at the fidelity of the signal, as long as you hold your remote control steady and in position.<\/p>\n

\"Silver<\/a>
Silver Bullet Infrared Receiver circuit diagram<\/figcaption><\/figure>\n

In our tests we were consistently able to display & trigger signals on the screen of the oscilloscope with 1 volt peaks, with ease. Another benefit of this approach is that there is no additional noise creeping in from external power supplies.<\/p>\n

\"Get<\/a>
Get accurate measurement of modulation frequency & duty cycle.<\/figcaption><\/figure>\n

To make it easy to construct and use over an extended period with the Oscilloscope we used a 2 part connector. The first part is a standard male BNC to female RCA adapter and the second part which houses the IR LED is a special male RCA connector plug with plenty of room to mount the IR LED.<\/p>\n

\"An<\/a>
An Inside View – showing the IR Led, BNC & RCA connectors.<\/figcaption><\/figure>\n

STEP1:<\/strong> If you have a diode checker on your multimeter, check that the LED is working. For the TSAL6100 our multimeter shows 1.1V->1.48V for forward voltage.<\/p>\n

STEP 2:<\/strong> Solder the 0805 SMD 10k ohm resistor across the legs of the IR LED, near the top (Bulb).\u00a0 Now confirm the resistance across the legs of IR LED is 10K, using your multimeter.\u00a0 Check that the IR LED is still working as in step 1. [UPDATE: We now prefer to use a 10K through hole resistor, which is much easier to solder]<\/p>\n

STEP 3:<\/strong> Cut the bottom of the legs off the IR LED so that when it is all assembled the LED bulb will be completely within the RCA plug( or just outside by 1->2mm). You can leave it longer and outside the plug if you wish, but we think it’s neater if it’s all inside. Keeping it just inside the RCA plug makes it much easier to align with the remote control.<\/p>\n

STEP 4:<\/strong> With the RCA cover off, solder the legs of the IR LED to the RCA plug. The anode goes to the central connection (signal) and the cathode goes to the outer part of the RCA plug (negative\/shielding). We were going to use heat shrink tubing to insulate the legs of the IR Led, but in the end it wasn’t needed. Depending on your setup you may require it. We will consider adding a bit of hot-glue later, if needed, which will provide extra stability and insulation. [Update: Using the thru-hole resistore avoids the need for extra insulation or hot-glue, as long as you are careful during assembly]<\/p>\n

STEP 5:<\/strong> Now place the cover onto the RCA plug and insert the RCA plug into the BNC adapter. You are now ready to connect your receiver to the Oscilloscope.<\/p>\n

By far the trickiest part of this assembly, was getting the SMD 0805 resistor soldered to the legs of the IR LED. Next time we will solder it on beforehand rather than after the LED is cut and soldered to the connector.<\/p>\n

Parts list:
\n<\/strong>1. TSAL6100 IR LED or equivalent (940nm wavelength)
\n2. 1 x 10K ohm 0805 SMD\/TH resistor or similar value. You could use standard thru-hole resistors, if they fit within your RCA plug.
\n3. 1 x male BNC to female RCA adapter. (See photo)
\n4. 1 x male RCA plug with plenty of room to house the IR LED & resistor. (See photo)
\n5. You will also require an Oscilloscope for testing.<\/p>\n

The reason we needed a receiver like this, is related to our previous post on Infrared signal lag & distortion with IR Receivers<\/a>. We need to be able to validate the quality of IR signal transmission and reception for a new product we are finishing off at present. The ‘silver bullet’<\/strong> receiver gives us yet another source of validation to satisfy our requirements.<\/p>\n

A more common use for a device like this would be to validate if your standard IR receiver is working correctly with difficult signals you are trying to decode. Frequently, we are asked by ‘Makers’ trying to decode difficult signals for assistance and this little device would quickly verify if the problem is with the IR receiver. Often, for longer Air Conditioner signals the basic or cheaper IR receiver isn’t able to cope.<\/p>\n

This device will also allow you to measure the modulation frequency of any IR signal, using your Oscilloscope.<\/p>\n

Of course you can also mock up this circuit on a solder-less breadboard quite easily, but we prefer to have a convenient device that we can just leave plugged into the spare channel of our oscilloscope.<\/p>\n

Stay tuned for our future post on an even better ‘poor-mans’ IR receiver<\/a>, which can be hooked up directly to your Arduino or any MCU.<\/p>\n

Update \/ Tip<\/strong>
\nMore recently we have started using the Silver Bullet attached to a coax cable via BNC to BNC adapter. This provides an extra level of flexibility at a greater distance from the scope, almost like a dedicated probe.\u00a0 Please remember that when using the Silver Bullet, you should set your scope channel to x1 and usually 200mV per division.<\/em><\/p>\n

Get your own ‘Silver-Bullet IR receiver.<\/strong> As the ‘Silver Bullet’ has proven to be very popular we now stock it in our shop. So if you would like your own, there are 2 options available.<\/p>\n

Option A<\/strong> – Kit of parts as described above, self-assembly and soldering required.<\/p>\n

Option B<\/strong> – Assembled unit – ready to go.<\/p>\n

Both Options are available for purchase now via our online shop (Click Here)<\/a><\/strong><\/p>\n

<\/form>\n

The AnlaysIR Team<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

A while ago we came across a website on infrared remote controls which suggested a simple way to view IR signals using an Oscilloscope. The idea is to use a standard IR Led mounted into a BNC\/RCA plug using a spare channel\u00a0 making an Oscilloscope infrared receiver. So we set about ordering the connectors, which … Continue reading ‘Silver bullet’ – the Oscilloscope Infrared Receiver<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1,61,257,15],"tags":[197,198,4,209,272,29,7,33,67,97,357,40,175,194,9,358],"class_list":["post-547","post","type-post","status-publish","format-standard","hentry","category-analysir-blog","category-ir-sources","category-products","category-analysir-ir-infrared-projects","tag-air-conditioner","tag-aircon","tag-analysir","tag-bnc","tag-carrier-frequency","tag-decoding","tag-infrared","tag-ir","tag-ir-receiver","tag-ir-signals","tag-ir-tool","tag-led","tag-oscilloscope","tag-rca","tag-remote-control","tag-workbench"],"yoast_head":"\n'Silver bullet' - 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After reading some mixed experiences on the Dangerous Prototypes forum we decided to put it to the test. So to start off we implemented a feature in AnalysIR\u2026","rel":"","context":"In "AnalysIR Blog"","block_context":{"text":"AnalysIR Blog","link":"https:\/\/www.analysir.com\/blog\/analysir-blog\/"},"img":{"alt_text":"UIRToyModulation38kHz","src":"https:\/\/i0.wp.com\/www.analysir.com\/blog\/wp-content\/uploads\/2014\/01\/UIRToyModulation38kHz-300x220.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":455,"url":"https:\/\/www.analysir.com\/blog\/2014\/03\/05\/arduino-10-common-pitfalls-infrared-remote-control\/","url_meta":{"origin":547,"position":3},"title":"Arduino: 10 common pitfalls with Infrared Remote Control","author":"User Two","date":"March 5, 2014","format":false,"excerpt":"Over the last few months we have been regular contributors to the Arduino and other forums, answering questions about Infrared remote control projects. 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