# Newbie question about square waves

**URL:** <https://discourse.psychopy.org/t/newbie-question-about-square-waves/13094>\
**Category:** Builder\
**Created:** [May 6, 2020, 7:21pm UTC](https://discourse.psychopy.org/t/newbie-question-about-square-waves/13094 "2020-05-06T19:21:45Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Stephen\_Engel](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/stephen_engel/32/5689_2.png) [@Stephen\_Engel](https://discourse.psychopy.org/u/Stephen_Engel)\
**Post date:** [May 6, 2020, 7:21pm UTC](https://discourse.psychopy.org/t/newbie-question-about-square-waves/13094/1 "2020-05-06T19:21:45Z")

</div>

Just getting started with PsychoPy, and forgive the newbie question, but I’d like to make a sqr grating in Builder that is red and black, or green and black. Tried playing with grating parameters, but nothing obvious to me helped. Any solutions?  
Thanks!

---

<div class="post-metadata">

**Author:** ![Michael](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/michael/32/16_2.png) [@Michael](https://discourse.psychopy.org/u/Michael)\
**Post date:** [May 7, 2020, 5:10am UTC](https://discourse.psychopy.org/t/newbie-question-about-square-waves/13094/2 "2020-05-07T05:10:32Z")

</div>

Does this help?

[https://groups.google.com/forum/#!topic/psychopy-users/WQfw2PKUHg4](https://groups.google.com/forum/#!topic/psychopy-users/WQfw2PKUHg4)

---

<div class="post-metadata">

**Author:** ![Stephen\_Engel](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/stephen_engel/32/5689_2.png) [@Stephen\_Engel](https://discourse.psychopy.org/u/Stephen_Engel)\
**Post date:** [May 7, 2020, 3:16pm UTC](https://discourse.psychopy.org/t/newbie-question-about-square-waves/13094/3 "2020-05-07T15:16:43Z")

</div>

Yes, thanks! Not obvious is that you cant do textures in pix units.